Câu 1.tính a. _5/3+1/2:3/4 b. -3/7-4/9+10/7 c-7/15+4/15-1/3 d. (9/10-4/5):2/5+1 Câu 2.tìm x A. 2x+1/4=3/2 B. x+1/7=1/2

Câu 1.tính
a. _5/3+1/2:3/4
b. -3/7-4/9+10/7
c-7/15+4/15-1/3
d. (9/10-4/5):2/5+1
Câu 2.tìm x
A. 2x+1/4=3/2
B. x+1/7=1/2

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  1. a) $\frac{-5}{3}$ + $\frac{1}{2}$ : $\frac{3}{4}$

    = $\frac{-5}{3}$ + $\frac{2}{3}$

    = -1

     b) $\frac{-3}{7}$ – $\frac{4}{9}$ +$\frac{10}{7}$

    = ($\frac{-3}{7}$ – $\frac{10}{7}$ ) + $\frac{4}{9}$

    = $\frac{-13}{7}$ + $\frac{4}{9}$

    = $\frac{-117}{28}$

    c) $\frac{-7}{15}$ + $\frac{4}{15}$ – $\frac{1}{3}$

    = $\frac{-7}{15}$ + $\frac{4}{15}$ – $\frac{5}{15}$

    = $\frac{-8}{15}$ 

    d) ($\frac{9}{10}$ – $\frac{4}{5}$ ) : $\frac{2}{5}$ + 1

    = ($\frac{9}{10}$ – $\frac{8}{10}$) . $\frac{5}{2}$ + 1

    = $\frac{1}{10}$ . $\frac{5}{2}$ +1

    = $\frac{1}{4}$ + 1

    = $\frac{5}{4}$ 

    Câu 2:

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

    2x = $\frac{3}{2}$ – $\frac{1}{4}$

    2x = $\frac{6}{4}$ – $\frac{1}{4}$

    2x = $\frac{5}{4}$

    x = $\frac{5}{4}$ : 2

    x = $\frac{5}{4}$ . $\frac{1}{2}$

    x = $\frac{5}{8}$ 

    b) x + $\frac{1}{7}$ = $\frac{1}{2}$

    x = $\frac{1}{2}$ – $\frac{1}{7}$

    x = $\frac{7}{14}$ – $\frac{2}{14}$

    x = $\frac{5}{14}$ 

    #chucbanhoctot

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