Đáp án:
Giải thích các bước giải:
Tìm x :
a)
x + $\frac{3}{8}$ × $\frac{6}{12}$ = 2$\frac{1}{4}$
x + $\frac{3}{16}$ = $\frac{9}{4}$
x = $\frac{9}{4}$ - $\frac{3}{16}$
x = $\frac{33}{16}$
b)
x - 5$\frac{3}{4}$ = $\frac{27}{6}$ × $\frac{16}{9}$
x - $\frac{23}{4}$ = 8
x = 8 + $\frac{23}{4}$
x = $\frac{55}{4}$
c)
x × 5$\frac{1}{3}$ = 3$\frac{3}{5}$ + 1$\frac{2}{5}$
x × $\frac{16}{3}$ = $\frac{18}{5}$ + $\frac{7}{5}$
x × $\frac{16}{3}$ = 3
x = 3 : $\frac{16}{3}$
x = $\frac{9}{16}$
d)
x : 1$\frac{2}{7}$ + 2 = 3$\frac{8}{9}$
x : $\frac{9}{7}$ + 2 = $\frac{35}{9}$
x : $\frac{9}{7}$ = $\frac{35}{9}$ - 2
x : $\frac{9}{7}$ = $\frac{17}{9}$
x = $\frac{17}{9}$ × $\frac{9}{7}$
x = $\frac{51}{31}$
