9 x (-3) = - 27
150 x (-4) = - 600
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Các câu hỏi tương tự
8-\(\frac{9}{4}+\frac{2}{7}\)-(-6-\(\frac{3}{7}+\frac{5}{4}\))-(3+\(\frac{2}{4}-\frac{9}{7}\))
tính biểu thức trên
\(A=49\frac{8}{23}-\left(5\frac{7}{32}+14\frac{8}{23}\right)\)
\(B=6\frac{3}{8}+5\frac{1}{2}\)
\(C=\frac{-3}{7}.\frac{5}{9}+\frac{4}{9}.\frac{-3}{7}+2\frac{3}{7}\)
\(D=8\frac{2}{7}-\left(3\frac{4}{9}+4\frac{2}{7}\right)\)
-5/9 + 2/9
4 - \(1\frac{3}{5}\)
-6/7 : 9/14
8/9 - (\(\left(2\frac{5}{8}+\frac{8}{9}\right)\)
2 /5 . (-4 /7) + 2/5 . (-3/7)+ \(1\frac{2}{5}\)
\(\frac{40}{9}\cdot\frac{4}{3}-\frac{4}{9}:\frac{13}{3}=....\)
Tính giá trị các biểu thức sau bằng phương pháp hợp lí
a) \(\frac{4}{5.7}+\frac{4}{7.9}+...+\frac{4}{59.61}\)
b) \(\frac{24.47-23}{24+47.23}.\frac{3+\frac{3}{7}-\frac{3}{11}+\frac{3}{1001}-\frac{3}{13}}{\frac{9}{1001}-\frac{9}{13}+\frac{9}{7}-\frac{9}{11}+9}\)
a)\(\frac{-2}{3}.x+\frac{1}{5}=\frac{3}{10}\)
b )\(2\frac{7}{9}-\frac{12}{13}x=\frac{7}{9}\)
c)\(\text{|}x\text{|}-\frac{3}{4}=\frac{5}{3}\)
d) \(\frac{17}{2}-\text{|}2x-\frac{3}{4}\text{|}=-\frac{7}{4}\)
\(\frac{\frac{2}{3}+\frac{2}{5}-\frac{2}{9}}{\frac{4}{3}+\frac{4}{5}-\frac{4}{9}}\)
A=\(\frac{\frac{2}{3}+\frac{2}{5}-\frac{2}{9}}{\frac{4}{3}+\frac{4}{5}-\frac{4}{9}}\)
tính nhanh
\(\frac{4}{9}.\frac{13}{3}-\frac{4}{3}.\frac{40}{9}\)
CMR: \(A=\frac{9}{5^2}\)+\(\frac{9}{11^2}+\frac{9}{17^2}+...+\frac{9}{305^2}<\frac{3}{4}\)