题目内容
解方程:
| x-40=15 | 3x+1.5=6 | 16x-7x=27 | 3.8x-x=0.56. |
(1)x-40=15,
x-40+40=15+40,
x=55;
(2)3x+1.5=6,
3x+1.5-1.5=6-1.5,
3x=4.5,
3x÷3=4.5÷3,
x=1.5;
(3)16x-7x=27,
9x=27,
9x÷9=27÷9,
x=3;
(4)3.8x-x=0.56,
2.8x=0.56,
2.8x÷2.8=0.56÷2.8,
x=0.2.
x-40+40=15+40,
x=55;
(2)3x+1.5=6,
3x+1.5-1.5=6-1.5,
3x=4.5,
3x÷3=4.5÷3,
x=1.5;
(3)16x-7x=27,
9x=27,
9x÷9=27÷9,
x=3;
(4)3.8x-x=0.56,
2.8x=0.56,
2.8x÷2.8=0.56÷2.8,
x=0.2.
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