题目内容
| 解下列方程. 5x+1.57=7.5 | (x-3)÷2=7.5 |
| x÷7=0.3 | x+3.2=4.6. |
(1)5x+1.57=7.5
5x+1.57-1.57=7.5-1.57
5x=5.93
5x÷5=5.93÷5
x=1.186;
(2)(x-3)÷2=7.5
(x-3)÷2×2=7.5×2
x-3=15
x-3+3=15+3
x=18;
(3)x÷7=0.3
x÷7×7=0.3×7
x=2.1;
(4)x+3.2=4.6
x+3.2-3.2=4.6-3.2
x=1.4.
5x+1.57-1.57=7.5-1.57
5x=5.93
5x÷5=5.93÷5
x=1.186;
(2)(x-3)÷2=7.5
(x-3)÷2×2=7.5×2
x-3=15
x-3+3=15+3
x=18;
(3)x÷7=0.3
x÷7×7=0.3×7
x=2.1;
(4)x+3.2=4.6
x+3.2-3.2=4.6-3.2
x=1.4.
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