几道简便运算题（5-0.2）*3.9+4.8*（4+2.1）166+978 4/7÷4216÷30*25（1/3*1/8

1.原算式=4.8*3.9+4.8*6.1
=4.8*（3.9+6.1）
=4.8*10
=48
2.原算式=166-3+97+3
=163+100
=263
3.原算式=12/4
=3
4.原算式=216/15/（4*25）/2
=216/7.5/100
=216/750
=0.288
5.原算式=1/3*3*1/8*8
=1*1=1
6.原算式=1/12*（2/3+1/3）
=1/12*1
=1/12
7.原算式=1/4*0.2+1/4*0.8
=1/4*1
=0.25
8.原算式=0.72*58+0.72*42
=0.72*100
=72
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