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解方程x-=2.2x+3.3x=66x-=7m-2m=12.5-x=9x+7=21.4.
题目详情
解方程
x-![]() ![]() | 2.2x+3.3x=66 | x-![]() ![]() |
7m-2m=12.5 | ![]() ![]() | 9x+7=21.4. |
▼优质解答
答案和解析
(1)x-
=
,
x-
+
=
+
,
x=
;
(2)2.2x+3.3x=66,
5.5x=66,
5.5x÷5.5=66÷5.5,
x=12;
(3)x-
=
,
x-
+
=
+
,
x=
;
(4)7m-2m=12.5,
5m=12.5,
5m÷5=12.5÷5,
m=2.5;
(5)
-x=
,
x=
-
,
x=
;
(6)9x+7=21.4,
9x+7-7=21.4-7,
9x=14.4,
9x÷9=14.4÷9,
x=1.6.
(1)x-
![](http://hiphotos.baidu.com/zhidao/pic/item/a686c9177f3e6709e8abe93838c79f3df9dc5549.jpg)
![](http://hiphotos.baidu.com/zhidao/pic/item/63d0f703918fa0ec9b48c8ca259759ee3c6ddb6e.jpg)
x-
![](http://hiphotos.baidu.com/zhidao/pic/item/a686c9177f3e6709e8abe93838c79f3df9dc5549.jpg)
![](http://hiphotos.baidu.com/zhidao/pic/item/a686c9177f3e6709e8abe93838c79f3df9dc5549.jpg)
![](http://hiphotos.baidu.com/zhidao/pic/item/63d0f703918fa0ec9b48c8ca259759ee3c6ddb6e.jpg)
![](http://hiphotos.baidu.com/zhidao/pic/item/a686c9177f3e6709e8abe93838c79f3df9dc5549.jpg)
x=
![](http://hiphotos.baidu.com/zhidao/pic/item/1ad5ad6eddc451dabd21a02cb5fd5266d1163225.jpg)
(2)2.2x+3.3x=66,
5.5x=66,
5.5x÷5.5=66÷5.5,
x=12;
(3)x-
![](http://hiphotos.baidu.com/zhidao/pic/item/9358d109b3de9c822e4b69486f81800a18d843cf.jpg)
![](http://hiphotos.baidu.com/zhidao/pic/item/6159252dd42a283494c7b3cc58b5c9ea14cebf90.jpg)
x-
![](http://hiphotos.baidu.com/zhidao/pic/item/9358d109b3de9c822e4b69486f81800a18d843cf.jpg)
![](http://hiphotos.baidu.com/zhidao/pic/item/9358d109b3de9c822e4b69486f81800a18d843cf.jpg)
![](http://hiphotos.baidu.com/zhidao/pic/item/6159252dd42a283494c7b3cc58b5c9ea14cebf90.jpg)
![](http://hiphotos.baidu.com/zhidao/pic/item/9358d109b3de9c822e4b69486f81800a18d843cf.jpg)
x=
![](http://hiphotos.baidu.com/zhidao/pic/item/562c11dfa9ec8a13147bd227f403918fa1ecc090.jpg)
(4)7m-2m=12.5,
5m=12.5,
5m÷5=12.5÷5,
m=2.5;
(5)
![](http://hiphotos.baidu.com/zhidao/pic/item/63d0f703918fa0ec9b48c8ca259759ee3c6ddb6e.jpg)
![](http://hiphotos.baidu.com/zhidao/pic/item/d31b0ef41bd5ad6ee71cc82d82cb39dbb7fd3c0b.jpg)
x=
![](http://hiphotos.baidu.com/zhidao/pic/item/63d0f703918fa0ec9b48c8ca259759ee3c6ddb6e.jpg)
![](http://hiphotos.baidu.com/zhidao/pic/item/d31b0ef41bd5ad6ee71cc82d82cb39dbb7fd3c0b.jpg)
x=
![](http://hiphotos.baidu.com/zhidao/pic/item/ac345982b2b7d0a2d80da85ac8ef76094a369a35.jpg)
(6)9x+7=21.4,
9x+7-7=21.4-7,
9x=14.4,
9x÷9=14.4÷9,
x=1.6.
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