问题 解答题
解方程或解比例
6×3-1.8x=7.210:x=4.5:0.8
1
4
1
8
=x:
1
10
答案

(1)6×3-1.8x=7.2,

18-1.8x=7.2,

18-1.8x+1.8x=7.2+1.8x,

18=7.2+1.8x,

18-7.2=7.2+1.8x-7.2,

10.8=1.8x,

10.8÷1.8=1.8x÷1.8,

x=6;

(2)10:x=4.5:0.8,

4.5x=10×0.8,

4.5x=8,

4.5x÷4.5=8÷4.5,

x=

16
9

(3)

1
4
1
8
=x:
1
10

1
8
x=
1
4
×
1
10

1
8
x=
1
40

1
8
1
8
=
1
40
÷
1
8

x=

1
5

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