7.5=0.3x2.5 3.2=0.4x2x4
带进去 乘法分配律
0.3x(2.5x0.4)x2x(4x0.25)=0.6
7.5 X 3.2 X 0.25
=3X2.5 X 4X0.2X4 X 0.25
=3X(2.5 X 4)X0.2X(4 X 0.25)
=3X10X0.2X1
=30X0.2
=6
(7.5*0.8)(4*0.25)=6*1=6
7.5*3.2*0.25
=(7.5*0.8)*(4*0.25)
=6*1
=6
7.5*3.2*0.25
=2.5*0.4*3*2*(4*0.25)
=1*3*2*1
=6
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