9.42*10-94.2*0.9
=94.2-94.2*0.9
=94.2*（1-0.9）
=94.2*0.1
=9.42
3.61/（7.2-5.3）*25
=3.61/1.9*25
=1.9*25
=（2-0.1）*25
=2*25-0.1*25
=50-2.5
=47.5第二题好乱啊~请重新写一下3.61/（7.2-5.3）*25=3.61/1.9*25=1.9*25=（2-0.1）*25=2*25-0.1*25=50-2.5=47.52.4*1.5+3.6/1.5 怎么算2.4*1.5+3.6/1.5=2.4*1.5+2.4=2.4*（1.5+1）=2.4*2.5=6