问题 解答题
解方程或解比例.
①6×(x+2.1)=18;
x
4
=1.25;
6
x
=20:6.
答案

①6×(x+2.1)=18

6x+12.6=18

6x+12.6-12.6=18-12.6

6x=5.4

6x÷6=5.4÷6

x=0.9

x
4
=1.25

x
4
×4=1.25×4

x=5

6
x
=20:6

20x=6×6

20x=36

x=1.8

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