Bài 1:
a) 1$\frac{5}{7}$ ×$\frac{3}{4}$ = $\frac{9}{7}$
b) $\frac{10}{11}$ : 1$\frac{1}{3}$ = $\frac{10}{11}$:$\frac{4}{3}$
= $\frac{10}{11}$ × $\frac{3}{4}$
= $\frac{15}{22}$.
c) 3,57×4,1+2,43×4,1 = (3,57+2,43)×4,1
= 6×4,11
= 24,6.
d) 3,42:0,57×8,4-6,8= 6×8,4-6,8
= 50,4-6,8
=43,6.