1. thực hiện phép tính
a, 36+3.(4-12) b. \(2-\frac{3}{4}\)
c.\(\frac{18}{24}:\frac{5}{2}+\frac{7}{-10}\) d.\((\frac{12}{199}-\frac{23}{200}+\frac{34}{201})-(\frac{1}{2}-\frac{1}{3}-\frac{1}{6})\)
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Thực hiện phép tính:a) frac{11}{24}-frac{5}{41}+frac{13}{24}+0,5-frac{36}{41}b)-12:left(frac{3}{4}-frac{5}{6}right)^2c)frac{7}{23}.left[left(frac{-8}{6}right)-frac{45}{18}right]d)23frac{1}{4}.frac{7}{5}-13frac{1}{4}:frac{5}{7}e)left(1+frac{2}{3}-frac{1}{4}right).left(0,8-frac{3}{4}right)^2
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Thực hiện phép tính:
a) \(\frac{11}{24}-\frac{5}{41}+\frac{13}{24}+0,5-\frac{36}{41}\)
b)\(-12:\left(\frac{3}{4}-\frac{5}{6}\right)^2\)
c)\(\frac{7}{23}.\left[\left(\frac{-8}{6}\right)-\frac{45}{18}\right]\)
d)\(23\frac{1}{4}.\frac{7}{5}-13\frac{1}{4}:\frac{5}{7}\)
e)\(\left(1+\frac{2}{3}-\frac{1}{4}\right).\left(0,8-\frac{3}{4}\right)^2\)
a) \(\frac{11}{24}-\frac{5}{41}+\frac{13}{24}+0,5-\frac{36}{41}\)
= \(\frac{11}{24}-\frac{5}{41}+\frac{13}{24}+\frac{1}{2}-\frac{36}{41}\)
= \(\frac{1}{2}-\left\{\frac{11}{24}+\frac{13}{24}\right\}-\left\{\frac{5}{41}+\frac{36}{41}\right\}\)
=\(\frac{1}{2}-\frac{24}{24}-\frac{41}{41}\)
=\(\frac{1}{2}-1-1\)
=\(\frac{-3}{2}\)
b) \(-12:\left\{\frac{3}{4}-\frac{5}{6}\right\}^2\)
= \(-12:\left\{\frac{9}{12}-\frac{10}{12}\right\}^2\)
= \(-12:\left\{\frac{-1}{12}\right\}^2\)
= \(-12:\frac{1}{144}\)
= \(-12.144\)
= -1728
c) \(\frac{7}{23}.\left[\left(\frac{-8}{6}\right)-\frac{45}{18}\right]\)
= \(\frac{7}{23}.\left[\left(\frac{-24}{18}\right)-\frac{45}{18}\right]\)
= \(\frac{7}{23}.\left(\frac{-23}{6}\right)\)
= \(\frac{-7}{6}\)
d) \(23\frac{1}{4}.\frac{7}{5}-13\frac{1}{4}:\frac{5}{7}\)
= \(23\frac{1}{4}.\frac{7}{5}-13\frac{1}{4}.\frac{7}{5}\)
= \(\left\{23\frac{1}{4}-13\frac{1}{4}\right\}.\frac{7}{5}\)
= \(10.\frac{7}{5}\)
= 14
e) (1+23−14).(0,8−34)2
= (1+23−14).(\(\frac{4}{5}\)−34)2
= \(\left(\frac{12}{12}+\frac{8}{12}-\frac{3}{12}\right).\left(\frac{16}{20}-\frac{15}{20}\right)^2\)
= \(\frac{17}{12}.\left(\frac{1}{20}\right)^2\)
= \(\frac{17}{20}.\frac{1}{400}\)
= \(\frac{17}{8000}\)
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1. Tính nhanh
a, \(\frac{7}{13}.\frac{7}{15}-\frac{5}{12}.\frac{21}{39}+\frac{49}{91}.\frac{8}{15}\)
b, \(\left(\frac{12}{199}+\frac{23}{200}-\frac{34}{201}\right).\left(\frac{1}{2}-\frac{1}{3}-\frac{1}{6}\right)\)
c,\(\frac{5}{2.1}+\frac{4}{1.11}+\frac{3}{11.2}+\frac{1}{2.15}+\frac{13}{15.4}\)
B1: Thực hiện phép tính :a, 11frac{3}{4}-(6frac{5}{6}-4frac{1}{2})+1frac{2}{3}b, 2frac{17}{20}-1frac{11}{5}+6frac{9}{20}:3c, 4frac{3}{7}:left(frac{7}{5}.4frac{3}{7}right)d, left(3frac{2}{9}.frac{15}{23}.1frac{7}{29}right):frac{5}{23}B2: Thực hiện phép tính:a,11frac{3}{4}-(6frac{5}{6}4frac{1}{2}+1frac{2}{3})
b,left(5frac{7}{8}-2frac{1}{4}-0,5right):frac{23}{26}c,left(17frac{13}{15}-3frac{3}{7}right)-left(2frac{12}{15}-4right)
d,2frac{2}{3}.frac{-4}{5}.0,375-left(-10right).frac{-15}{24}
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B1: Thực hiện phép tính :
a, \(11\frac{3}{4}-(6\frac{5}{6}-4\frac{1}{2})+1\frac{2}{3}\)
b, \(2\frac{17}{20}-1\frac{11}{5}+6\frac{9}{20}:3\)
c, \(4\frac{3}{7}:\left(\frac{7}{5}.4\frac{3}{7}\right)\)
d, \(\left(3\frac{2}{9}.\frac{15}{23}.1\frac{7}{29}\right):\frac{5}{23}\)
B2: Thực hiện phép tính:
\(a,11\frac{3}{4}-(6\frac{5}{6}4\frac{1}{2}+1\frac{2}{3})\\ b,\left(5\frac{7}{8}-2\frac{1}{4}-0,5\right):\frac{23}{26}\)
\(c,\left(17\frac{13}{15}-3\frac{3}{7}\right)-\left(2\frac{12}{15}-4\right)\\ d,2\frac{2}{3}.\frac{-4}{5}.0,375-\left(-10\right).\frac{-15}{24}\)
1.thực hiện phép tínha,frac{18}{24}:frac{5}{2}+frac{7}{-10} (frac{12}{199}-frac{23}{200}+frac{34}{201}).(frac{1}{2}-frac{1}{3}-frac{1}{6})2.tìm xa, x+515 b,x-frac{5}{3}frac{1}{9}c,frac{x}{15}-frac{-2}{3}+frac{3}{5} d,frac{x}{9} frac{7}{x} frac{x}{6}(xin z)
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1.thực hiện phép tính
a,\(\frac{18}{24}:\frac{5}{2}+\frac{7}{-10}\) \((\frac{12}{199}-\frac{23}{200}+\frac{34}{201}).(\frac{1}{2}-\frac{1}{3}-\frac{1}{6})\)
2.tìm x
a, x+5=15 b,\(x-\frac{5}{3}=\frac{1}{9}\)
\(c,\frac{x}{15}-\frac{-2}{3}+\frac{3}{5}\) \(d,\frac{x}{9}< \frac{7}{x}< \frac{x}{6}(x\in z)\)
\(1.a,\frac{18}{24}:\frac{5}{2}+\frac{7}{-10}\)
\(=\frac{18}{24}:\frac{5}{2}+\frac{-7}{10}\)
\(=\frac{18}{24}\cdot\frac{2}{5}+\frac{-7}{10}\)
\(=\frac{3}{4}\cdot\frac{2}{5}+\frac{-7}{10}\)
\(=\frac{3}{2}\cdot\frac{1}{5}+\frac{-7}{10}\)
\(=\frac{3}{10}+\frac{-7}{10}=\frac{-4}{10}=\frac{-2}{5}\)
\(\left[\frac{12}{199}-\frac{23}{200}+\frac{34}{201}\right]\cdot\left[\frac{1}{2}-\frac{1}{3}-\frac{1}{6}\right]\)
\(=\left[\frac{12}{199}-\frac{23}{200}+\frac{34}{201}\right]\cdot\left[\frac{3}{6}-\frac{2}{6}-\frac{1}{6}\right]\)
\(=\left[\frac{12}{199}-\frac{23}{200}+\frac{34}{201}\right]\cdot\left[\frac{3-2-1}{6}\right]\)
\(=\left[\frac{12}{199}-\frac{23}{200}+\frac{34}{301}\right]\cdot0=0\)
2. \(a,x+5=15\Leftrightarrow x=15-5=10\)
\(b,x-\frac{5}{3}=\frac{1}{9}\)
\(\Leftrightarrow x=\frac{1}{9}+\frac{5}{3}\)
\(\Leftrightarrow x=\frac{1}{9}+\frac{15}{9}=\frac{16}{9}\)
c, Sửa lại đề một xíu :
\(\frac{x}{15}=\frac{-2}{3}+\frac{3}{5}\)
\(\Leftrightarrow\frac{x}{15}=\frac{-10}{15}+\frac{9}{15}\)
\(\Leftrightarrow\frac{x}{15}=\frac{-1}{15}\)
\(\Leftrightarrow x=-1\)
\(d,\frac{x}{9}< \frac{7}{x}< \frac{x}{6}(x\inℤ)\)
\(\frac{x\cdot x}{9\cdot x}< \frac{7\cdot9}{9\cdot x}< \frac{7\cdot6}{6\cdot x}\)
\(\Leftrightarrow\frac{x^2}{9x}< \frac{63}{9x}< \frac{42}{6x}\)
Tự làm nốt :>
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Thực hiện phép tính:a) frac{-3}{5}+frac{28}{5}left(frac{43}{56}+frac{5}{24}-frac{21}{63}right)b) frac{5}{7}.frac{11}{18}+frac{3}{7}.frac{5}{18}+frac{4}{9}c) frac{-3}{4}.5frac{3}{13}-0,75.frac{36}{13}d) 6frac{5}{12}:2frac{3}{4}-11frac{1}{4}.left(frac{1}{3}-frac{1}{5}right)e) left(frac{3}{5}+0,415-frac{3}{200}right).2frac{2}{3}.0,25
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Thực hiện phép tính:
a) \(\frac{-3}{5}+\frac{28}{5}\left(\frac{43}{56}+\frac{5}{24}-\frac{21}{63}\right)\)
b) \(\frac{5}{7}.\frac{11}{18}+\frac{3}{7}.\frac{5}{18}+\frac{4}{9}\)
c) \(\frac{-3}{4}.5\frac{3}{13}-0,75.\frac{36}{13}\)
d) \(6\frac{5}{12}:2\frac{3}{4}-11\frac{1}{4}.\left(\frac{1}{3}-\frac{1}{5}\right)\)
e) \(\left(\frac{3}{5}+0,415-\frac{3}{200}\right).2\frac{2}{3}.0,25\)
Tính nhanh:
a,\(\frac{7}{13}\cdot\frac{7}{15}-\frac{5}{12}\cdot\frac{21}{39}+\frac{49}{91}\cdot\frac{8}{15}\)
b,\(\left(\frac{12}{199}+\frac{23}{200}-\frac{34}{201}\right)\cdot\left(\frac{1}{2}-\frac{1}{3}-\frac{1}{6}\right)\)
\(a.\left(\frac{12}{199}+\frac{23}{200}-\frac{34}{201}\right)\cdot\left(\frac{1}{2}-\frac{1}{3}-\frac{1}{6}\right)\)
=\(\left(\frac{12}{199}+\frac{23}{200}-\frac{34}{201}\right)\cdot\left(\frac{1}{2}-\frac{1}{3}-\frac{1}{6}\right)\)
=\(\left(\frac{12}{199}+\frac{23}{200}-\frac{34}{201}\right)\cdot\left(\frac{3}{6}-\frac{2}{6}-\frac{1}{6}\right)\)
=\(\left(\frac{12}{199}+\frac{23}{200}-\frac{34}{201}\right)\cdot0\)
\(=0\)
Kết quả = 0 nhé, nhớ ủng hộ mh, mh đang âm diểm
~ HOK TỐT ~
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\(\left(\frac{12}{199}+\frac{23}{200}-\frac{34}{201}\right)\left(\frac{1}{2}-\frac{1}{3}-\frac{1}{6}\right)\)
\(=\left(\frac{12}{199}+\frac{23}{200}-\frac{34}{201}\right)\left(\frac{3}{6}-\frac{2}{6}-\frac{1}{6}\right)\)
\(=\left(\frac{12}{199}+\frac{23}{200}-\frac{34}{201}\right)\cdot0\)
\(=0\)
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\(\left(\frac{12}{199}+\frac{23}{200}-\frac{34}{201}\right).\left(\frac{1}{2}-\frac{1}{3}-\frac{1}{6}\right)\)
\(=\left(\frac{12}{199}+\frac{23}{200}-\frac{34}{201}\right).0\)
\(=0\)
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Xem thêm câu trả lời
1.Thực hiện phép tính:(hepl me)a)frac{-3}{5}+frac{28}{5}timesleft(frac{43}{56}+frac{5}{24}-frac{21}{63}right)b)frac{5}{7}timesfrac{11}{18}+frac{3}{7}timesfrac{5}{18}+frac{4}{9}c)frac{-3}{4}times5frac{3}{13}-0,75timesfrac{36}{13}d)6frac{5}{12}:2frac{3}{4}-11frac{1}{4}timesleft(frac{1}{3}-frac{1}{5}right)e)left(frac{3}{5}+0,415-frac{3}{200}right)times2frac{2}{3}times0,25
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\(\)1.Thực hiện phép tính:(hepl me)
a)\(\frac{-3}{5}\)+\(\frac{28}{5}\)\(\times\)\(\left(\frac{43}{56}+\frac{5}{24}-\frac{21}{63}\right)\)
b)\(\frac{5}{7}\times\frac{11}{18}+\frac{3}{7}\times\frac{5}{18}+\frac{4}{9}\)
c)\(\frac{-3}{4}\times5\frac{3}{13}-0,75\times\frac{36}{13}\)
d)\(6\frac{5}{12}:2\frac{3}{4}-11\frac{1}{4}\times\left(\frac{1}{3}-\frac{1}{5}\right)\)
e)\(\left(\frac{3}{5}+0,415-\frac{3}{200}\right)\times2\frac{2}{3}\times0,25\)
Bài làm :
a)\(=-\frac{3}{5}+\frac{28}{5}\times\frac{9}{14}=-\frac{3}{5}+\frac{18}{5}=3\)
b)\(=\frac{55}{126}+\frac{5}{42}+\frac{4}{9}=1\)
c)\(=-\frac{51}{13}-\frac{27}{13}=-6\)
d)\(=\frac{7}{3}-11\frac{1}{4}\times\frac{2}{15}=\frac{7}{3}-\frac{3}{2}=\frac{5}{6}\)
e)\(=1\times\frac{8}{3}\times0,25=\frac{2}{3}\)
26 tháng 2 2020 lúc 12:19
Thực hiện phép tính
a) \(\left(\frac{-1}{6}+\frac{5}{-12}\right)+\frac{7}{12}\)
b) \(\frac{7}{36}-\frac{8}{-9}+\frac{-2}{3}\)
c)\(\frac{3}{5}-\frac{2}{5}\cdot\frac{10}{12}\)
d)\(\frac{2}{(-3)^2}+\frac{5}{-12}-\frac{-3}{4}\)
a) \(\left(\frac{-1}{6}+\frac{5}{-12}\right)+\frac{7}{12}=\left(\frac{-2}{12}+\frac{-5}{12}\right)+\frac{7}{12}=\left(\frac{-7}{12}\right)+\frac{7}{12}=0\)
b)\(\frac{7}{36}-\frac{8}{-9}+\frac{-2}{3}=\frac{7}{36}+\frac{32}{36}-\frac{24}{36}=\frac{15}{36}=\frac{5}{12}\)
c) \(\frac{3}{5}-\frac{2}{5}.\frac{10}{12}=\frac{3}{5}-\frac{2}{5}.\frac{5}{6}=\frac{3}{5}-\frac{1}{3}=\frac{9}{15}-\frac{5}{15}=\frac{4}{15}\)
d) \(\frac{2}{\left(-3\right)^2}+\frac{5}{-13}-\frac{-3}{4}=\frac{2}{9}-\frac{5}{13}+\frac{3}{4}=\frac{8}{36}-\frac{15}{36}+\frac{27}{36}=\frac{5}{9}\)