Câu hỏi của Tu Anh Duong

Question

Tinh nhanh:

a) 3/10 . (-5/9+3/5) - 3/10 . (3/9+(-2/5)

Huỳnh Châu Giang · Accepted Answer

$\frac{3}{10}.\left(-\frac{5}{9}+\frac{3}{5}\right)-\frac{3}{10}.\left(\frac{3}{9}+\frac{-2}{5}\right)$

=$\frac{3}{10}.\frac{2}{45}-\frac{3}{10}.\left(-\frac{1}{15}\right)$

$=\frac{3}{10}.\left(\frac{2}{45}-\left(-\frac{1}{15}\right)\right)$

$=\frac{3}{10}.\frac{1}{9}=\frac{1}{30}$

Câu trả lời:

$\frac{3}{10}.\left(-\frac{5}{9}+\frac{3}{5}\right)-\frac{3}{10}.\left(\frac{3}{9}+\frac{-2}{5}\right)$

=$\frac{3}{10}.\frac{2}{45}-\frac{3}{10}.\left(-\frac{1}{15}\right)$

$=\frac{3}{10}.\left(\frac{2}{45}-\left(-\frac{1}{15}\right)\right)$

$=\frac{3}{10}.\frac{1}{9}=\frac{1}{30}$

Tuyet Trinh Le · Answer

$3/10.(-59+35)-310.(39+-25)310.(-59+35)-310.(39+-25)$

= $310.245-310.(-115)310.245-310.(-115)$

$=310.(245-(-115))=310.(245-(-115))$

$=310.19=130$

Câu trả lời:

$3/10.(-59+35)-310.(39+-25)310.(-59+35)-310.(39+-25)$

= $310.245-310.(-115)310.245-310.(-115)$

$=310.(245-(-115))=310.(245-(-115))$

$=310.19=130$

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