=4.12×(7.2+1.6)+8.8×0.88=4.12×8.8+8.8×0.88=8.8×(4.12+0.88)=8.8×5=44
先做前面两组,如下:4.12(7.2+1.6)+8.8*0.88=4.12*8.8+0.88*8.8=8.8(4.12+0.88)=44
(7.2+1.6)*4.12+8.8*0.88=8.8*4.12+8.8*0.88=8.8*(4.12+0.88)=8.8*5=44