简算：32.4-12.4*1.8

简算：32.4-12.4*1.8
简算：32.4-12.4*1.8

简算：32.4-12.4*1.8
既然是简便方法,楼上两位从32.4看出是18*1.8,有点难了点
32.4-12.4*1.8=32.4-12.4*（2-0.2）=32.4-12.4*2+12.4*0.2
=32.4-24.8+2.48
=（32.4+2.48）-24.8
=34.88-24.8=10.08

=18*1.8 - 12.4*1.8
=1.8*(18-12.4)
=1.8*(5.6)
=(2-0.2)*(5.6)
=11.2-1.12
=10.08

32.4-12.4*1.8=1.8*18-12.4*1.8=1.8*（18-12.4）

1.8*（18-12.4）=1.8*5.6=10.08