题目内容
| 解方程 2(x+1.7)=9.2 | 3x-4×4.5=6.36 | 7x+2.5x=3.8 | (3.8-2)x=14.4. |
(1)2(x+1.7)=9.2,
2x+2×1.7=9.2,
2x+3.4-3.4=9.2-3.4,
2x=5.8,
2x÷2=5.8÷2,
x=2.9;
(2)3x-4×4.5=6.36,
3x-18=6.36,
3x-18+18=6.36+18,
3x=24.36,
3x÷3=24.36÷3,
x=8.12;
(3)7x+2.5x=3.8,
9.5x=3.8,
9.5x÷9.5=3.8÷9.5,
x=0.4;
(4)(3.8-2)x=14.4,
1.6x=14.4,
1.6x÷1.6=14.4÷1.6,
x=9.
2x+2×1.7=9.2,
2x+3.4-3.4=9.2-3.4,
2x=5.8,
2x÷2=5.8÷2,
x=2.9;
(2)3x-4×4.5=6.36,
3x-18=6.36,
3x-18+18=6.36+18,
3x=24.36,
3x÷3=24.36÷3,
x=8.12;
(3)7x+2.5x=3.8,
9.5x=3.8,
9.5x÷9.5=3.8÷9.5,
x=0.4;
(4)(3.8-2)x=14.4,
1.6x=14.4,
1.6x÷1.6=14.4÷1.6,
x=9.
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