作业帮若a-b/a+b=4 则代数式2a﹣2b/a+b-4a+4b/3a-3b=
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若a-b/a+b=4 则代数式2a﹣2b/a+b-4a+4b/3a-3b=
若a-b/a+b=4 则代数式2a﹣2b/a+b-4a+4b/3a-3b=
若a-b/a+b=4 则代数式2a﹣2b/a+b-4a+4b/3a-3b=
(a-b)/(a+b)=4
∴(a+b)/(a-b)=1/4
2a﹣2b/a+b-4a+4b/3a-3b
=2(a-b)/(a+b)-(a+b)/(a-b)*4/3
=2*4-1/4*4/3
=8-1/3
=23/3 7又2/3
若a-b/a+b=4 则代数式2a﹣2b/a+b-4a+4b/3a-3b=2x4-4/3=20/3
2a﹣2b/a+b-4a+4b/3a-3b
=2*4-4/3*1/4
=8-1/3
=23/3
2a﹣2b/a+b-4a+4b/3a-3b=2(a-b)/(a+b)-4(a+b)/3(a-b)=2×4-4×1/4=8-1=7