题目内容
解方程.
÷x=16
(1+
)x=26
x+
x=120
x-40%x=
.
| 8 |
| 9 |
(1+
| 2 |
| 5 |
x+
| 2 |
| 3 |
x-40%x=
| 15 |
| 16 |
分析:(1)根据等式的性质,两边同乘x,得16x=
,两边同除以16即可;
(2)原式变为
x=26,根据等式的性质,两边同乘
即可;
(3)原式变为
x=120,根据等式的性质,两边同乘
即可;
(4)原式变为
x=
,根据等式的性质,两边同乘
即可.
| 8 |
| 9 |
(2)原式变为
| 7 |
| 5 |
| 5 |
| 7 |
(3)原式变为
| 5 |
| 3 |
| 5 |
| 3 |
(4)原式变为
| 3 |
| 5 |
| 15 |
| 16 |
| 5 |
| 3 |
解答:解:(1)
÷x=16,
÷x×x=16×x
16x=
,
16x÷16=
÷16,
x=
;
(2)(1+
)x=26,
x=26,
x×
=26×
,
x=
;
(3)x+
x=120,
x=120,
x×
=120×
,
x=200;
(4)x-40%x=
,
x=
,
x×
=
×
,
x=
.
| 8 |
| 9 |
| 8 |
| 9 |
16x=
| 8 |
| 9 |
16x÷16=
| 8 |
| 9 |
x=
| 1 |
| 18 |
(2)(1+
| 2 |
| 5 |
| 7 |
| 5 |
| 7 |
| 5 |
| 5 |
| 7 |
| 5 |
| 7 |
x=
| 130 |
| 7 |
(3)x+
| 2 |
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| 3 |
| 5 |
| 5 |
| 3 |
x=200;
(4)x-40%x=
| 15 |
| 16 |
| 3 |
| 5 |
| 15 |
| 16 |
| 3 |
| 5 |
| 5 |
| 3 |
| 15 |
| 16 |
| 5 |
| 3 |
x=
| 25 |
| 16 |
点评:此题考查了根据等式的性质解方程,即等式两边同加上、同减去、同乘上或同除以一个不为0的数,等式仍相等.同时注意“=”上下要对齐.
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