题目内容
解方程
0.8x-0.4=1.2 x-25%x=36
x+x=4.
0.8x-0.4=1.2 x-25%x=36
7 | 9 |
分析:(1)等式的两边同时加上0.4,然后等式的两边同时除以0.8即可;
(2)先计算x-25%x=0.75x,然后等式的两边同时除以0.75即可;
(3)先计算
x+x=
x,然后等式的两边同时除以
即可.
(2)先计算x-25%x=0.75x,然后等式的两边同时除以0.75即可;
(3)先计算
7 |
9 |
16 |
9 |
16 |
9 |
解答:解:
(1)0.8x-0.4=1.2,
0.8x-0.4+0.4=1.2+0.4,
0.8x=1.6,
0.8x÷0.8=1.6÷0.8,
x=2;
(2)x-25%x=36,
0.75x=36,
0.75x÷0.75=36÷0.75,
x=48;
(3)
x+x=4,
x=4,
x÷
=4÷
,
x=
.
(1)0.8x-0.4=1.2,
0.8x-0.4+0.4=1.2+0.4,
0.8x=1.6,
0.8x÷0.8=1.6÷0.8,
x=2;
(2)x-25%x=36,
0.75x=36,
0.75x÷0.75=36÷0.75,
x=48;
(3)
7 |
9 |
16 |
9 |
16 |
9 |
16 |
9 |
16 |
9 |
x=
9 |
4 |
点评:本题主要考查解方程,根据等式的性质进行解答即可.
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