问题 解答题
解方程.
0.3x+90%=5412-5x=6.5
2
3
x-
1
2
x=42.
答案

(1)0.3x+90%=54,

0.3x+90%-90%=54-90%,

0.3x=53.1,

0.3x÷0.3=53.1÷0.3,

x=177;

(2)12-5x=6.5,

12-5x+5x=6.5+5x,

5x+6.5=12,

5x+6.5-6.5=12-6.5,

5x=5.5,

5x÷5=5.5÷5,

x=1.1;

(3)

2
3
x-
1
2
x=42,

1
6
x=42,

1
6
1
6
=42÷
1
6

x=252.

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