Alfredcn
幼苗
共回答了15个问题采纳率:66.7% 举报
①[3分之1(x-y)]×(x-y)
=(x-y)²/3;
②若2^x+3×3^x+3
=6^(x+3)
=36^x-2,
=6^(2x-4);
x+3=2x-4;
x=7;
3、简算(-3分之2)^2001×2又4分之1)^1000
=(-2/3)^2001×(9/4)^1000
=(-2/3)^2001×(3/2)^2000
=(-2/3)×(-2/3×3/2)^2000
=-2/3×1
=-2/3;
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Alfredcn
[3分之1(x-y)]×(x-y) =(1/3)×(x-y)×(x-y) =(1/3)×(x-y)²;