Trắc nghiệm bài tập theo tuần Toán 7-Tuần 3 có đáp án

Tính

$\left(-2\frac{1}{5}\right).\left(\frac{-9}{11}\right).\left(-1\frac{1}{14}\right).\frac{2}{5}$

Tính

$\left(-5\frac{1}{2}\right).\left(\frac{-1}{2}\right)-\frac{2}{3}.\left(-\frac{2}{3}\right)$

Tính

$\left(1\frac{1}{4}\right).\left(\frac{-8}{15}\right)-\frac{3}{5}+\frac{2}{5}.\left(-\frac{3}{4}\right)$

Tính

$\left(-\mathrm{0,125}\right).\left(-16\right).\left(-\frac{8}{9}\right).\left(-\mathrm{0,25}\right)$

Tính

$\left(13\frac{9}{11}:\frac{38}{49}-5\frac{2}{11}:\frac{38}{49}\right):\left(\frac{49}{38}.\frac{5}{11}\right)$

Tính

$\frac{11}{30}+\frac{18}{35}.\left(\frac{35}{54}-\frac{49}{18}-\frac{28}{48}\right)$

Tính

$\frac{-23}{39}.\frac{-13}{56}.\frac{70}{23}:\frac{125}{75}$

Tìm x

$-\frac{2}{3}:x+\frac{5}{8}=-\frac{7}{12}$

Tìm x

$\frac{1}{2}x+2\frac{1}{2}=3\frac{1}{2}x-\frac{3}{4}$

Tìm x

$\frac{2}{3}x-\frac{2}{5}=\frac{1}{2}x-\frac{1}{3}$

Tìm x

$\frac{1}{3}x+\frac{2}{5}\left(x+1\right)=0$

Tính nhanh: 

$\left(\frac{1}{2}-1\right)\left(\frac{1}{3}-1\right)\left(\frac{1}{4}-1\right)\mathrm{.....}\left(\frac{1}{1999}-1\right)$

Tính nhanh:

$\frac{5.18-10.27+15.36}{10.36-20.54+30.72}$

Tính nhanh:

$-1\frac{1}{2}.\left(-1\frac{1}{3}\right).\left(-1\frac{1}{4}\right)\mathrm{......}\left(-1\frac{1}{1999}\right)$