题目内容
解方程. x+17=43 |
x-2.4=0.7 | 6.1+x=9 | x-3.8=47.2. |
分析:(1)等式两边同时减去17;
(2)等式两边同时加2.4;
(3)等式两边同时减6.1;
(4)等式两边同时加3.8;即可得解.
(2)等式两边同时加2.4;
(3)等式两边同时减6.1;
(4)等式两边同时加3.8;即可得解.
解答:解:(1)x+17=43
x+17-17=43-17
x=26;
(2)x-2.4=0.7
x-2.4+2.4=0.7+2.4
x=3.1;
(3)6.1+x=9
6.1+x-6.1=9-6.1
x=2.9;
(4)x-3.8=47.2
x-3.8+3.8=47.2+3.8
x=51.
x+17-17=43-17
x=26;
(2)x-2.4=0.7
x-2.4+2.4=0.7+2.4
x=3.1;
(3)6.1+x=9
6.1+x-6.1=9-6.1
x=2.9;
(4)x-3.8=47.2
x-3.8+3.8=47.2+3.8
x=51.
点评:根据等式的性质来求解,注意等号要对齐.
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