Question

7.2×0.32+0.64×1.9-0.32简便运算

Answer 1

=7.2×0.32+0.32×2×1.9-0.32
=7.2×0.32+0.32×3.8-0.32

=0.32×（7.2+3.8-1）
=0.32×10
=3.2

Answer 2

7.2×0.32+0.64×1.9-0.32

=7.2×0.32+0.32*2×1.9-0.32
=(7.2+2*1.9-1)*0.32
=10*0.32
=3.2

追问

帮忙算一下1.25÷（4×2.5÷4×2.5）简便运算

追答

1.25÷（4×2.5÷4×2.5）

=1.25÷(2.5*2.5)
=1.25÷2.5÷2.5
=0.5÷2.5=0.2