\(\frac{\left(2,7-0,8\right)-7}{\left(5,2-1,4\right).\frac{7}{3}}=\frac{1,9-7}{\frac{133}{15}}=-\frac{51}{10}:\frac{133}{15}=-\frac{153}{266}\)
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thực hiện phép tính
a, (-3/4+ 5/6): (2/9 - 7/12)
Tìm x, biết:
a, 1,5+ 1/1/4 x= 2/3
b, (2,7 x - 1/1/2 x) : 2/7= -21/4
c, 5/8 +1/3: x = 1/2
d, -5/6+ 8/3 + -29/6 < x < -1/2+ 2+ 5/2 ( với x thuộc Z)
Rút gọn
1.left(frac{2}{45}-frac{4}{13}-frac{1}{3}right):left(frac{3}{13}-frac{4}{15}+frac{2}{13}right)
2.frac{0,8:left(frac{4}{5}.1,25right)}{0,64-frac{1}{25}}+frac{left(1,08-frac{2}{15}right):frac{4}{7}}{left(6frac{5}{9}-3frac{1}{4}right)2frac{2}{17}}
3.frac{0,4-frac{2}{9}+frac{2}{11}}{1,4-frac{7}{9}+frac{7}{11}}-frac{frac{1}{3}-0,25+frac{1}{5}}{1frac{1}{6}-0,875+0,7}
Đọc tiếp
Rút gọn
1.\(\left(\frac{2}{45}-\frac{4}{13}-\frac{1}{3}\right):\left(\frac{3}{13}-\frac{4}{15}+\frac{2}{13}\right)\)
2.\(\frac{0,8:\left(\frac{4}{5}.1,25\right)}{0,64-\frac{1}{25}}+\frac{\left(1,08-\frac{2}{15}\right):\frac{4}{7}}{\left(6\frac{5}{9}-3\frac{1}{4}\right)2\frac{2}{17}}\)
3.\(\frac{0,4-\frac{2}{9}+\frac{2}{11}}{1,4-\frac{7}{9}+\frac{7}{11}}-\frac{\frac{1}{3}-0,25+\frac{1}{5}}{1\frac{1}{6}-0,875+0,7}\)
tính:
a) 2dfrac{3}{4}.left(-0,4right)-1dfrac{3}{5}.2,75+left(-1,2right):dfrac{4}{11}
b) 1,4.dfrac{15}{49}-left(dfrac{4}{5}+dfrac{2}{3}right):2dfrac{1}{5}
c) left(-3,2right).dfrac{15}{64}+left(0,8-2dfrac{4}{15}right):3dfrac{2}{3}
d) 0,02.dfrac{-25}{2}+dfrac{3}{8}+left(-2dfrac{9}{20}right).dfrac{2}{7}
e) 34%:dfrac{51}{16}-3dfrac{7}{9}.6,5-left(0,4right)^2
Đọc tiếp
tính:
a) \(2\dfrac{3}{4}.\left(-0,4\right)-1\dfrac{3}{5}.2,75+\left(-1,2\right):\dfrac{4}{11}\)
b) \(1,4.\dfrac{15}{49}-\left(\dfrac{4}{5}+\dfrac{2}{3}\right):2\dfrac{1}{5}\)
c) \(\left(-3,2\right).\dfrac{15}{64}+\left(0,8-2\dfrac{4}{15}\right):3\dfrac{2}{3}\)
d) \(0,02.\dfrac{-25}{2}+\dfrac{3}{8}+\left(-2\dfrac{9}{20}\right).\dfrac{2}{7}\)
e) \(34\%:\dfrac{51}{16}-3\dfrac{7}{9}.6,5-\left(0,4\right)^2\)
Câu 1.Tính:
1\(\dfrac{7}{20}:2,7+2,7:1,35\)
b)3\(\dfrac{1}{2}-\)(0,4:2\(\dfrac{1}{2}\)).(4,2-1\(\dfrac{3}{4}\))
Cho biểu thức:\(A=\left(9\frac{3}{4}:5,2+x.2\frac{7}{24}\right):1\frac{9}{16}\)
Tìm x biết A=6
3/7+2/21-3/14
5/4-5/12+3/8
7/12x8/21:2/3
làm giúp mình với các bạn nha
Thực hiện phép tính:
\(\dfrac{-5}{12}.\dfrac{2}{7}+\dfrac{7}{12}:\dfrac{-14}{3}\)
b) 1,4.\(\dfrac{15}{49}-\left(80\%+\dfrac{2}{3}\right):2\dfrac{1}{5}\)
Bài 1: Thực hiện phép tính 1 cách hợp lý : a) left(1+frac{1}{1.3}right).left(1+frac{1}{2.4}right).left(1+frac{1}{3.5}right)...left(1+frac{1}{2009.2011}right)b) frac{16}{9}-frac{1}{36}-frac{1}{28}-frac{1}{21}-frac{1}{15}-frac{1}{10}-frac{1}{6}-frac{1}{3}-1 c) frac{0,4-frac{2}{9}+frac{2}{11}-frac{2}{37}}{1,4-frac{7}{9}-frac{7}{11}-frac{7}{37}}-frac{frac{1}{3}-0,25+frac{1}{5}}{1frac{1}{6}-0,785+0,7}
Đọc tiếp
Bài 1: Thực hiện phép tính 1 cách hợp lý :
\(a\)) \(\left(1+\frac{1}{1.3}\right).\left(1+\frac{1}{2.4}\right).\left(1+\frac{1}{3.5}\right)...\left(1+\frac{1}{2009.2011}\right)\)
\(b\)) \(\frac{16}{9}-\frac{1}{36}-\frac{1}{28}-\frac{1}{21}-\frac{1}{15}-\frac{1}{10}-\frac{1}{6}-\frac{1}{3}-1\)
\(c\)) \(\frac{0,4-\frac{2}{9}+\frac{2}{11}-\frac{2}{37}}{1,4-\frac{7}{9}-\frac{7}{11}-\frac{7}{37}}-\frac{\frac{1}{3}-0,25+\frac{1}{5}}{1\frac{1}{6}-0,785+0,7}\)
Bài 9: so sánh
1) 2/3 vaˋ 1/4
2) 7/10 vaˋ 7/8
3) 6/7 vaˋ 3/5
4) 14/21 vaˋ 60/72