(40十0.8)x2.5=40x2.5+0.8x2.5=100+2=102
7.28十3.2x2.5=7.28十0.8x4x2.5=7.28+0.8x10=7.28+8=15.28
0.4x0.8x1.255x2.5= (0.4x2.5)x(0.8x1.25+0.8*0.005)= 1 x(1+0.004)= 1 x 1.004= 1.004
解,原式=0.5x12.5x(8x0.4x2)x2.5 =(0.5x2)x(12.5x8)x(0.4x2.5) =1x100x1 =100
0.4x63x2.5=0.4x2.5x63=1x63=63
4.4x2.5=(4+0.4)x2.5=4x2.5+0.4x2.5=10+0.1=10.01
4x(6.3x2.5)=4x2.5x6.3=10x6.3=63
3.5x0.8x2.4=0.7x5x0.8x2.4=0.7x4x2.4=0.7x9.6=6.72
0.4*2.5*12
原式=61.7÷(4*2.5)=61.7÷10=6.17