Câu 6:
a, $\frac{3}{5}$ + $\frac{5}{3}$ × $\frac{2}{25}$
= $\frac{3}{5}$ + $\frac{2}{15}$
= $\frac{9}{15}$ + $\frac{2}{15}$
= $\frac{11}{15}$
b, 78,612 : 12 = 6,551
78,612 | 12
6 6 | 6,551
61 |
12 |
0 |
Câu 7:
a, 47,95 × 3,85 + 52,05 × 3,85 = 3,85 × ( 47,95 + 52,05 ) = 3,85 × 100 = 385
b, $\frac{214,5:100-2145:1000}{25×9,6×4}$ = $\frac{2,145-2,145}{25×4×9,6}$ = $\frac{0}{25×4×9,6}$ = 0
c, 6,25 × 0,75 × 32 = 6,25 × 32 × 0,75 = 200 × 0,75 = 150
d, $\frac{4,8×0,5+30,4×0,25}{200×0,05}$ = $\frac{2,4+7,6}{10}$ = $\frac{10}{10}$ = 1
(xin hay nhất + 5 sao)
Chúc e,m học tốt!!!
