解方程(要过程)
1)3/10+3.7x=15.6
解,得:
3.7x===15.6-0.3
3.7x==15.3
x==153/37
2)0.6*(x-0.6)=0.6
解,得:
x-0.6==1
x==1.6
9*3-17/10x=13.4
解,得:
-17/10x==-13.6
x==13.6/1.7
x==8
简便运算
1)20-[7.8+(6.2+1.29)]
解,得:
==20-(7.8+6.2+1.29)
==20-14-1.29
==6-1.29
==4.71
2)[(10-1÷25)÷99.6】+0.01
解,得:
==(9.96/99.6)+0.01
==0.1+0.01
==0.11