(4a-7b)(4a+7b)-2a(8a-5)=?
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(4a-7b)(4a+7b)-2a(8a-5)=?
(4a-7b)(4a+7b)-2a(8a-5)=?
(4a-7b)(4a+7b)-2a(8a-5)=?
﹙4a-7b﹚﹙4a+7b﹚-2a﹙8a-5﹚
=16a²-49b²-16a²+10a
=10a-49b²
原式=16a²-49b²-16a²+10a
=10a-49b²
=16a²-49b²-16a²+10a
=10a-49b²
(4a-7b)(4a+7b)-2a(8a-5)
=4a²-49b²-16a²+10a
=-12a²+10a²-49b²
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初二分式的加减法2a-b-c/(a-b)(a-c)+ 2b-c-a/(b-c)(b-a)+ 2c-b-a/(c-b)(c-a)3a-6b/a+b- 5a-6b/a-b- 4a-5b/a+b+ 7a-8b/b-a注:有空格的地方是下一个分式
2a-{7b+[4a-7b-(2a-6a-4b)]-3a
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(4a-7b)(4a+7b)-2a(8a-5)=?
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