先化简再求值,[(2b-a)(3a+2b)-(a+2b)²]÷(-0.5a)a=2,b=0.75
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先化简再求值,[(2b-a)(3a+2b)-(a+2b)²]÷(-0.5a)a=2,b=0.75
先化简再求值,[(2b-a)(3a+2b)-(a+2b)²]÷(-0.5a)
a=2,b=0.75
先化简再求值,[(2b-a)(3a+2b)-(a+2b)²]÷(-0.5a)a=2,b=0.75
〔(2b-a)(3a+2b)-(-a+2b)^2〕=[(2b-a)(3a+2b-2b+a)]=(2b-a)*4a
〔(2b-a)(3a+2b)-(-a+2b)^2〕除以(-1/2a)
=(2b-a)*4a/(-1/2a)
=8a^2[a-2b]
代入a=2,b=0.75
原式=32x(2-0.75*2)=16