题目内容
| 解方程. 6x-0.3×3=3.9 | (x+4)÷7=9.1 | x-0.28x=2.16. |
(1)6x-0.3×3=3.9,
6x-0.9=3.9,
6x-0.9+0.9=3.9+0.9,
6x=4.8,
6x÷6=4.8÷6,
x=0.8;
(2)(x+4)÷7=9.1,
(x+4)÷7×7=9.1×7,
x+4=63.7,
x+4-4=63.7-4,
x=59.7;
(3)x-0.28x=2.16,
x(1-0.28)=2.16,
0.72x=2.16,
0.72x÷0.72=2.16÷0.72,
x=3.
6x-0.9=3.9,
6x-0.9+0.9=3.9+0.9,
6x=4.8,
6x÷6=4.8÷6,
x=0.8;
(2)(x+4)÷7=9.1,
(x+4)÷7×7=9.1×7,
x+4=63.7,
x+4-4=63.7-4,
x=59.7;
(3)x-0.28x=2.16,
x(1-0.28)=2.16,
0.72x=2.16,
0.72x÷0.72=2.16÷0.72,
x=3.
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