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(1)12(2)(3)(4)2(3x-2x2y)-3(x-3x2y)(5)3a2-[8a-(4a-7)-2a2](6)
题目详情
(1)
12(2)
(3)![](http://hiphotos.baidu.com/zhidao/pic/item/2934349b033b5bb590f7ef3635d3d539b700bcd2.jpg)
(4)2(3x-2x2y)-3(x-3x2y)(5)3a2-[8a-(4a-7)-2a2](6)![](http://hiphotos.baidu.com/zhidao/pic/item/0dd7912397dda144c206a37ab1b7d0a20df486ef.jpg)
![](http://hiphotos.baidu.com/zhidao/pic/item/54fbb2fb43166d227478da5c452309f79152d2ef.jpg)
![](http://hiphotos.baidu.com/zhidao/pic/item/f7246b600c338744a6e5e0b4520fd9f9d62aa0d2.jpg)
![](http://hiphotos.baidu.com/zhidao/pic/item/2934349b033b5bb590f7ef3635d3d539b700bcd2.jpg)
(4)2(3x-2x2y)-3(x-3x2y)(5)3a2-[8a-(4a-7)-2a2](6)
![](http://hiphotos.baidu.com/zhidao/pic/item/0dd7912397dda144c206a37ab1b7d0a20df486ef.jpg)
▼优质解答
答案和解析
(1)
12
=-
×12+
×12+
×12
=-1+9+2
=10;
(2)![](http://hiphotos.baidu.com/zhidao/pic/item/f7246b600c338744a6e5e0b4520fd9f9d62aa0d2.jpg)
=-
-2×
×![](http://hiphotos.baidu.com/zhidao/pic/item/a686c9177f3e6709e8abe93838c79f3df9dc5549.jpg)
=-
-![](http://hiphotos.baidu.com/zhidao/pic/item/8718367adab44aed497d2e23b01c8701a08bfbc2.jpg)
=-
;
(3)![](http://hiphotos.baidu.com/zhidao/pic/item/2934349b033b5bb590f7ef3635d3d539b700bcd2.jpg)
=-1-4×(-27)÷![](http://hiphotos.baidu.com/zhidao/pic/item/2934349b033b5bb570b98f3935d3d539b700bc8f.jpg)
=-1-4×(-27)×![](http://hiphotos.baidu.com/zhidao/pic/item/54fbb2fb43166d22d419ba53452309f79152d28f.jpg)
=-1-(-48)
=-1+48
=-47;
(4)2(3x-2x2y)-3(x-3x2y)
=6x-4x2y-3x+9x2y
=3x+5x2y;
(5)3a2-[8a-(4a-7)-2a2]
=3a2-[8a-4a+7-2a2]
=3a2-8a+4a-7+2a2
=5a2-4a-7;
(6)![](http://hiphotos.baidu.com/zhidao/pic/item/0dd7912397dda144c206a37ab1b7d0a20df486ef.jpg)
=-2x+1-3+2x
=-2.
![](http://hiphotos.baidu.com/zhidao/pic/item/54fbb2fb43166d227478da5c452309f79152d2ef.jpg)
=-
![](http://hiphotos.baidu.com/zhidao/pic/item/f7246b600c33874449e0bfbb520fd9f9d62aa0d4.jpg)
![](http://hiphotos.baidu.com/zhidao/pic/item/0d338744ebf81a4ce1f6400ed42a6059242da635.jpg)
![](http://hiphotos.baidu.com/zhidao/pic/item/9358d109b3de9c822e4b69486f81800a18d843cf.jpg)
=-1+9+2
=10;
(2)
![](http://hiphotos.baidu.com/zhidao/pic/item/f7246b600c338744a6e5e0b4520fd9f9d62aa0d2.jpg)
=-
![](http://hiphotos.baidu.com/zhidao/pic/item/500fd9f9d72a60598d4f71dd2b34349b023bba9e.jpg)
![](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/500fd9f9d72a60598d4f71dd2b34349b023bba9e.jpg)
![](http://hiphotos.baidu.com/zhidao/pic/item/8718367adab44aed497d2e23b01c8701a08bfbc2.jpg)
=-
![](http://hiphotos.baidu.com/zhidao/pic/item/dc54564e9258d109456a3075d258ccbf6d814d68.jpg)
(3)
![](http://hiphotos.baidu.com/zhidao/pic/item/2934349b033b5bb590f7ef3635d3d539b700bcd2.jpg)
=-1-4×(-27)÷
![](http://hiphotos.baidu.com/zhidao/pic/item/2934349b033b5bb570b98f3935d3d539b700bc8f.jpg)
=-1-4×(-27)×
![](http://hiphotos.baidu.com/zhidao/pic/item/54fbb2fb43166d22d419ba53452309f79152d28f.jpg)
=-1-(-48)
=-1+48
=-47;
(4)2(3x-2x2y)-3(x-3x2y)
=6x-4x2y-3x+9x2y
=3x+5x2y;
(5)3a2-[8a-(4a-7)-2a2]
=3a2-[8a-4a+7-2a2]
=3a2-8a+4a-7+2a2
=5a2-4a-7;
(6)
![](http://hiphotos.baidu.com/zhidao/pic/item/0dd7912397dda144c206a37ab1b7d0a20df486ef.jpg)
=-2x+1-3+2x
=-2.
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