bn tham khảo
d,1$\frac{1}{5}$ .$\frac{2}{3}$ -$\frac{1}{3}$ .1$\frac{1}{5}$
=1$\frac{1}{5}$.($\frac{2}{3}$ -$\frac{1}{3}$)
=1$\frac{1}{5}$.$\frac{1}{3}$
=$\frac{6}{5}$. $\frac{1}{3}$
=$\frac{2}{5}$
e,$\frac{1}{2}$ .$\frac{3}{2}$ ÷(0,4-$\frac{1}{3}$ )
=$\frac{1}{2}$ .$\frac{3}{2}$ ÷$\frac{1}{15}$
=$\frac{3}{4}$ $\frac{1}{15}$
=$\frac{45}{4}$
f,(8$\frac{10}{9}$ + 7$\frac{22}{199}$ -5$\frac{8}{999}$ ).(0,25-$\frac{1}{6}$ -$\frac{1}{12}$ )
=(8$\frac{10}{9}$ + 7$\frac{22}{199}$ -5$\frac{8}{999}$ ).($\frac{1}{12}$ -$\frac{1}{12}$ )
=(8$\frac{10}{9}$ + 7$\frac{22}{199}$ -5$\frac{8}{999}$ ).0
=0
bài 2
a, $\frac{42}{45}$ ÷ x =$\frac{6}{5}$
x =$\frac{42}{45}$ ÷ $\frac{6}{5}$
x =$\frac{7}{9}$
b,x . 12 - x ÷ 0,5 = 16
2x . 12 ÷ 0,5= 16
2x . 12 = 16 . 0,5
2x . 12 = 8
2x = 8÷12
2x = $\frac{3}{2}$
x=$\frac{3}{2}$ ÷ 2
x= $\frac{1}{3}$
chúc bn hc tốt
cho mk xin hay nhất nha
