题目内容
解下列方程
| (1)6x+15=51 | (2)3(x-8)=27 | (3)x÷2.8=8.2 | (4)(1.4x-0.7x=56) |
(1)6x+15=51,
6x+15-15=51-15,
6x=36,
6x÷6=36÷6,
x=6;
(2)3(x-8)=27,
3(x-8)÷3=27÷3,
x-8=9,
x-8+8=9+8,
x=17;
(3)x÷2.8=8.2,
x÷2.8×2.8=8.2×2.8,
x=22.96;
(4)1.4x-0.7x=56,
0.7x=56,
0.7x÷0.7=56÷0.7,
x=80.
6x+15-15=51-15,
6x=36,
6x÷6=36÷6,
x=6;
(2)3(x-8)=27,
3(x-8)÷3=27÷3,
x-8=9,
x-8+8=9+8,
x=17;
(3)x÷2.8=8.2,
x÷2.8×2.8=8.2×2.8,
x=22.96;
(4)1.4x-0.7x=56,
0.7x=56,
0.7x÷0.7=56÷0.7,
x=80.
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