\(=12-\left(-3\right)\cdot4+\left(-4\right)=12+3\cdot4-4=12+12=24\)
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Tính nhanh:
\(\left(\dfrac{67}{111}+\dfrac{2}{33}-\dfrac{15}{117}\right).\left(\dfrac{1}{3}-\dfrac{1}{4}-\dfrac{1}{12}\right)\)
8 tháng 9 2017 lúc 11:40
thực hiện phép tính
adfrac{5}{7}+dfrac{9}{23}+dfrac{-12}{7}+dfrac{14}{23}
bleft(7-2dfrac{3}{5}right).2dfrac{4}{33}-2dfrac{3}{5}:dfrac{1}{2}+dfrac{7}{5}
cdfrac{-7}{9}:dfrac{8}{15}+dfrac{-7}{9}.dfrac{7}{15}+5dfrac{7}{9}
dleft(16dfrac{3}{8}-19dfrac{3}{4}right)-left(12dfrac{3}{8}-17dfrac{3}{4}right)
giúp mình nhé
Đọc tiếp
thực hiện phép tính
a\(\dfrac{5}{7}+\dfrac{9}{23}+\dfrac{-12}{7}+\dfrac{14}{23}\)
b\(\left(7-2\dfrac{3}{5}\right).2\dfrac{4}{33}-2\dfrac{3}{5}:\dfrac{1}{2}+\dfrac{7}{5}\)
c\(\dfrac{-7}{9}:\dfrac{8}{15}+\dfrac{-7}{9}.\dfrac{7}{15}+5\dfrac{7}{9}\)
d\(\left(16\dfrac{3}{8}-19\dfrac{3}{4}\right)-\left(12\dfrac{3}{8}-17\dfrac{3}{4}\right)\)
giúp mình nhé
Bài 2: Tính hợp lý:
\(A=\dfrac{63636337-37373763}{1+2+3+...+2006}\)
\(B=1\dfrac{6}{41}\left(\dfrac{12+\dfrac{12}{19}-\dfrac{12}{37}-\dfrac{12}{53}}{3+\dfrac{1}{3}-\dfrac{3}{37}-\dfrac{3}{53}}:\dfrac{4+\dfrac{4}{17}+\dfrac{4}{19}+\dfrac{4}{2006}}{5+\dfrac{5}{17}+\dfrac{5}{19}+\dfrac{5}{2006}}\right)\dfrac{124242423}{237373735}\)
a)(dfrac{2}{9}(6x-dfrac{3}{4})-3(dfrac{1}{4}x-dfrac{1}{5})dfrac{-8}{15}
b)dfrac{3}{4}(x-dfrac{8}{9})-5(x-dfrac{11}{15})+dfrac{1}{2}x5dfrac{1}{12}
c)dfrac{2}{3}(-3x-dfrac{6}{5})-dfrac{5}{7}(dfrac{49}{15}-14x)-2dfrac{1}{3}
d)(12dfrac{7}{8}-10dfrac{13}{8}):x-1dfrac{7}{33}:dfrac{8}{11}1dfrac{2}{3}
Đọc tiếp
a)(\(\dfrac{2}{9}\)(6x-\(\dfrac{3}{4}\))-3(\(\dfrac{1}{4}\)x-\(\dfrac{1}{5}\))=\(\dfrac{-8}{15}\)
b)\(\dfrac{3}{4}\)(x-\(\dfrac{8}{9}\))-5(x-\(\dfrac{11}{15}\))+\(\dfrac{1}{2}\)x=5\(\dfrac{1}{12}\)
c)\(\dfrac{2}{3}\)(-3x-\(\dfrac{6}{5}\))-\(\dfrac{5}{7}\)(\(\dfrac{49}{15}\)-14x)=-2\(\dfrac{1}{3}\)
d)(12\(\dfrac{7}{8}\)-10\(\dfrac{13}{8}\)):x-1\(\dfrac{7}{33}\):\(\dfrac{8}{11}\)=1\(\dfrac{2}{3}\)
Tính bằng cách hợp lí: \(B=1\dfrac{6}{41}\cdot\left(\dfrac{12+\dfrac{12}{19}-\dfrac{12}{37}-\dfrac{12}{53}}{3+\dfrac{1}{3}-\dfrac{3}{37}-\dfrac{3}{53}}:\dfrac{4+\dfrac{4}{17}+\dfrac{4}{19}+\dfrac{4}{2006}}{5+\dfrac{5}{17}+\dfrac{5}{19}+\dfrac{5}{2006}}\right)\cdot\dfrac{124242423}{237373735}\)
Tính nhanh (nếu có thể):
a,frac{frac{3}{41}-frac{12}{47}+frac{27}{53}}{frac{4}{41}-frac{16}{47}+frac{36}{53}}+frac{-0,25.frac{-2}{3}-75%:(frac{-1}{2}+frac{2}{3})}{|-1frac{1}{2}|.(frac{-2}{3}-0,75:frac{3}{-2})}
b,A158.(frac{12-frac{12}{7}-frac{12}{289}-frac{12}{85}}{4-frac{4}{7}-frac{4}{289}-frac{4}{85}}:frac{5+frac{5}{13}+frac{5}{169}+frac{5}{91}}{6+frac{6}{13}+frac{6}{169}+frac{6}{91}}).frac{50550505}{711711711}
Đọc tiếp
Tính nhanh (nếu có thể):
\(a,\frac{\frac{3}{41}-\frac{12}{47}+\frac{27}{53}}{\frac{4}{41}-\frac{16}{47}+\frac{36}{53}}+\frac{-0,25.\frac{-2}{3}-75\%:(\frac{-1}{2}+\frac{2}{3})}{|-1\frac{1}{2}|.(\frac{-2}{3}-0,75:\frac{3}{-2})}\)
\(b,A=158.(\frac{12-\frac{12}{7}-\frac{12}{289}-\frac{12}{85}}{4-\frac{4}{7}-\frac{4}{289}-\frac{4}{85}}:\frac{5+\frac{5}{13}+\frac{5}{169}+\frac{5}{91}}{6+\frac{6}{13}+\frac{6}{169}+\frac{6}{91}}).\frac{50550505}{711711711}\)
Tính hợp lý ( nếu có thể)
a, (-17+|91|) -(91-|-17|-2011)
b, 4/7+5/6:5-0, 375.(-2) ²
c, -17/11:5/12+-4/12:5/12). 2.|-5|/3
Dấu chấm là nhân
Giúp mình với bạn nhé
2/3.x-3/2.(x-1/2)=5/12
1,5-2x.(-1 4/7)=11/4
Tính nhanh :
3 . 25 . 8 + 4 . 37 . 6 + 2 . 38 . 12