Question

Đã trả lời bởi chuyên gia

Answer 1

a) $\frac{2}{3} + \frac{1}{3} \times (\frac{- 4}{9} + \frac{5}{6}) : \frac{7}{12}$
= $\frac{2}{3} + \frac{1}{2} \times (\frac{- 8}{18} + \frac{15}{18}) : \frac{7}{12}$
= $\frac{2}{3} + \frac{1}{2} \times \frac{7}{18} : \frac{7}{12}$
= $\frac{2}{3} + \frac{1}{2} \times \frac{7}{18} \times \frac{12}{7}$
= $\frac{2}{3} + \frac{1}{2} \times \frac{12}{18}$
= $\frac{2}{3} + \frac{6}{18}$ = $\frac{12}{18} + \frac{6}{18} = \frac{18}{18} = 1$
b) $(4 - \frac{5}{12}) : 3 + \frac{7}{36}$
= $(\frac{48}{12} - \frac{5}{12}) : 3 + \frac{7}{36}$
= $\frac{43}{12} : 3 + \frac{7}{36}$
= $\frac{43}{12} \times \frac{1}{3} + \frac{7}{36}$
= $\frac{43}{36} + \frac{7}{36}$
= $\frac{50}{36}$ = $\frac{25}{18}$

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Answer 2

a) $\frac{2}{3} + \frac{1}{3} \times (\frac{- 4}{9} + \frac{5}{6}) : \frac{7}{12}$
= $\frac{2}{3} + \frac{1}{2} \times (\frac{- 8}{18} + \frac{15}{18}) : \frac{7}{12}$
= $\frac{2}{3} + \frac{1}{2} \times \frac{7}{18} : \frac{7}{12}$
= $\frac{2}{3} + \frac{1}{2} \times \frac{7}{18} \times \frac{12}{7}$
= $\frac{2}{3} + \frac{1}{2} \times \frac{12}{18}$
= $\frac{2}{3} + \frac{6}{18}$ = $\frac{12}{18} + \frac{6}{18} = \frac{18}{18} = 1$
b) $(4 - \frac{5}{12}) : 3 + \frac{7}{36}$
= $(\frac{48}{12} - \frac{5}{12}) : 3 + \frac{7}{36}$
= $\frac{43}{12} : 3 + \frac{7}{36}$
= $\frac{43}{12} \times \frac{1}{3} + \frac{7}{36}$
= $\frac{43}{36} + \frac{7}{36}$
= $\frac{50}{36}$ = $\frac{25}{18}$

Answer 3

Tim cho bố

1232+31x(−94+65):127Bước 1: Tính trong ngoặc
−49+56=−818+1518=718−94+65=−188+1815=187Bước 2: Nhân với 13x31x
13x⋅718=7x5431x⋅187=547xBước 3: Chia cho 712127
7x54:712=7x54⋅127=12x54=2x9547x:127=547x⋅712=5412x=92xBước 4: Cộng với 2332
23+2x9=69+2x9=2x+6932+92x=96+92x=92x+6

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