Bài 3 Tính nhanh A= ( 3 – 1/4 + 2/3 ) – (5 + 1/3 – 6/5 ) – ( 6 – 7/4 + 3/2 )

Đáp án:$\frac{-97}{15}$

Giải thích các bước giải:

A= ( 3 – 1/4 + 2/3 ) – (5 + 1/3 – 6/5 ) – ( 6 – 7/4 + 3/2 )

  = 3 – $\frac{1}{4}$ + $\frac{2}{3}$ – 5 -$\frac{1}{3}$ + $\frac{6}{5}$ -6 + $\frac{7}{4}$ – $\frac{3}{2}$

  = (3-5-6) + (  $\frac{-1}{4}$ + $\frac{7}{4}$ ) + ( $\frac{2}{3}$ – $\frac{1}{3}$ ) + $\frac{6}{5}$ + $\frac{-3}{2}$

= -8 + $\frac{3}{2}$ + $\frac{1}{3}$ + $\frac{6}{5}$ + $\frac{-3}{2}$

= -8 + ( $\frac{3}{2}$ + $\frac{-3}{2}$ ) + $\frac{6}{5}$ + $\frac{1}{3}$

= -8 + $\frac{6}{5}$ + $\frac{1}{3}$

=$\frac{-34}{5}$ + $\frac{1}{3}$

=$\frac{-97}{15}$

@Nguyenbatdiet

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