Question

还有7.2乘14.5加17乘2.8

Answer 1

3.6×11.1+1.2×66.7

=1.2×3×11.1+1.2×66.7

=1.2×33.3+1.2×66.7

=1.2×（33.3+66.7）

=1.2×100

=120

7.2×14.5+17×2.8

=7.2×（17-2.5）+17×2.8

=7.2×17-7.2×2.5+17×2.8

=17×（7.2+2.8）-1.8×4×2.5

=17×10-1.8×10

=170-18

=152