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帮忙算一下1.25÷（4×2.5÷4×2.5）简便运算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