解方程. 6×4-0.5x=12.8 5x-2+1.8=3.6 7(x-1.2)=2.1.
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解方程.
6×4-0.5x=12.8 | 5x-2+1.8=3.6 | 7(x-1.2)=2.1. |
(1)6×4-0.5x=12.8,
24-0.5x=12.8,
24-0.5x+0.5x=12.8+0.5x,
0.5x+12.8=24,
0.5x+12.8-12.8=24-12.8,
0.5x=11.2,
0.5x÷0.5=11.2÷0.5,
x=22.4;
(2)5x-2+1.8=3.6,
5x-2+1.8-1.8=3.6-1.8,
5x-2=1.8,
5x-2+2=1.8+2,
5x=3.8,
5x÷5=3.8÷5,
x=0.76;
(3)7(x-1.2)=2.1,
7(x-1.2)÷7=2.1÷7,
x-1.2=0.3,
x-1.2+1.2=0.3+1.2,
x=1.5.
24-0.5x=12.8,
24-0.5x+0.5x=12.8+0.5x,
0.5x+12.8=24,
0.5x+12.8-12.8=24-12.8,
0.5x=11.2,
0.5x÷0.5=11.2÷0.5,
x=22.4;
(2)5x-2+1.8=3.6,
5x-2+1.8-1.8=3.6-1.8,
5x-2=1.8,
5x-2+2=1.8+2,
5x=3.8,
5x÷5=3.8÷5,
x=0.76;
(3)7(x-1.2)=2.1,
7(x-1.2)÷7=2.1÷7,
x-1.2=0.3,
x-1.2+1.2=0.3+1.2,
x=1.5.
解方程. 6×4-0.5x=12.8 5x-2+1.8=3.6 7(x-1.2)=2.1.
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