Question

Tính nhanh: 3*145+3*55/6*215+6*85

 

Answer 1

\(3\times145+3\times\dfrac{55}{6}\times215+6\times85\)

\(=3\times145+3\times\dfrac{55}{6}\times215+3\times2\times85\)

\(=3\times\left(145+\left(\dfrac{55}{6}\times215\right)+\left(2\times85\right)\right)\)

\(=3\times\left(145+\dfrac{11825}{6}+170\right)\)

\(=3\times\dfrac{13715}{6}=6857,5\)

Answer 2

3*(145+55):6*(215+85)

3*200:6*300

600:6*300

100*300=30000

Answer 3

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