计算:(1)(a-b)²+b(2a+b) (2)x²/(x-z)+1/(1-x)打错了(2)应该是x²/(x-1)+1/(1-x)
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计算:(1)(a-b)²+b(2a+b) (2)x²/(x-z)+1/(1-x)打错了(2)应该是x²/(x-1)+1/(1-x)
计算:(1)(a-b)²+b(2a+b) (2)x²/(x-z)+1/(1-x)
打错了(2)应该是
x²/(x-1)+1/(1-x)
计算:(1)(a-b)²+b(2a+b) (2)x²/(x-z)+1/(1-x)打错了(2)应该是x²/(x-1)+1/(1-x)
(1)(a-b)²+b(2a+b)
=a²+b²-2ab+2ab+b²
=a²+2b²;
(2)x²/(x-z)+1/(1-x)
=x²/(x-1)-1/(x-1)
=(x²-1)/(x-1)
=x+1;
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