问题标题:
(要过程)已知3a-5b+19=0,a+8b-1=0,求:(1)-12a-9b(2)4a-26b(3)(4a+3b)×(4a+3b)-8a-6b
问题描述:
(要过程)已知3a-5b+19=0,a+8b-1=0,求:(1)-12a-9b(2)4a-26b(3)(4a+3b)×(4a+3b)-8a-6b
樊丽颖回答:
3a-5b=-19------1式a+8b=1-------2式-(a+8b)*3-(3a-5b)*3=-12a-9b=54(3a-5b)*2-(a+8b)*2=4a-26b=-404a+3b=1式+2式=-18问3=(4a+3b)^2-2(4a+3b)=-20(4a+3b)=360
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