a) 2/7 + x = -3/8 b) 7/15 + ( 5/6 – x ) = 9/10 c) x – 1 / 3 = -2/5 04/10/2021 Bởi Jade a) 2/7 + x = -3/8 b) 7/15 + ( 5/6 – x ) = 9/10 c) x – 1 / 3 = -2/5
a) 2/7 + x = -3/8 x = -3/8-2/7 x = -37/56 b) 7/15 + ( 5/6 – x ) = 9/10 5/6 – x = 9/10 – 7/15 5/6 – x = 13/30 x = 5/6 – 13/30 x = 2/5 c) x – 1 / 3 = -2/5 x = 1/3 + -2/5 x = -1/15 Bình luận
Đáp án: a) x = $\frac{-37}{56}$ b) x = 0,4 c) x = $\frac{-1}{15}$ Giải thích các bước giải: a) $\frac{2}{7}$ + x = $\frac{-3}{8}$ => x= $\frac{-3}{8}$ – $\frac{2}{7}$ = $\frac{-21}{56}$ – $\frac{16}{56}$ = $\frac{-37}{56}$ b) $\frac{7}{15}$ + ($\frac{5}{6}$ – x) = $\frac{9}{10}$ => $\frac{5}{6}$ – x = $\frac{9}{10}$ – $\frac{7}{15}$ => x= $\frac{5}{6}$ -($\frac{9}{10}$ – $\frac{7}{15}$ ) => x= $\frac{5}{6}$ – $\frac{9}{10}$ + $\frac{7}{15}$ => x= $\frac{25}{30}$ – $\frac{27}{30}$ + $\frac{14}{30}$ => x= $\frac{12}{30}$ => x= $\frac{2}{5}$ = 0,4 c) x – $\frac{1}{3}$ = -$\frac{2}{5}$ => x= -$\frac{2}{5}$ + $\frac{1}{3}$ => x= $\frac{-6}{15}$ + $\frac{5}{15}$ => x= $\frac{-1}{15}$ Xin hay nhất nha Bình luận
a) 2/7 + x = -3/8
x = -3/8-2/7
x = -37/56
b) 7/15 + ( 5/6 – x ) = 9/10
5/6 – x = 9/10 – 7/15
5/6 – x = 13/30
x = 5/6 – 13/30
x = 2/5
c) x – 1 / 3 = -2/5
x = 1/3 + -2/5
x = -1/15
Đáp án: a) x = $\frac{-37}{56}$
b) x = 0,4
c) x = $\frac{-1}{15}$
Giải thích các bước giải:
a) $\frac{2}{7}$ + x = $\frac{-3}{8}$
=> x= $\frac{-3}{8}$ – $\frac{2}{7}$ = $\frac{-21}{56}$ – $\frac{16}{56}$ = $\frac{-37}{56}$
b) $\frac{7}{15}$ + ($\frac{5}{6}$ – x) = $\frac{9}{10}$
=> $\frac{5}{6}$ – x = $\frac{9}{10}$ – $\frac{7}{15}$
=> x= $\frac{5}{6}$ -($\frac{9}{10}$ – $\frac{7}{15}$ )
=> x= $\frac{5}{6}$ – $\frac{9}{10}$ + $\frac{7}{15}$
=> x= $\frac{25}{30}$ – $\frac{27}{30}$ + $\frac{14}{30}$
=> x= $\frac{12}{30}$
=> x= $\frac{2}{5}$ = 0,4
c) x – $\frac{1}{3}$ = -$\frac{2}{5}$
=> x= -$\frac{2}{5}$ + $\frac{1}{3}$
=> x= $\frac{-6}{15}$ + $\frac{5}{15}$
=> x= $\frac{-1}{15}$
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