(X-2)(X²+2X)—(X+2)(X²-2X)计算题
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(X-2)(X²+2X)—(X+2)(X²-2X)计算题(X-2)(X²+2X)—(X+2)(X²-2X)计算题(X-2)(X²+2X)—(X+2)(
(X-2)(X²+2X)—(X+2)(X²-2X)计算题
(X-2)(X²+2X)—(X+2)(X²-2X)计算题
(X-2)(X²+2X)—(X+2)(X²-2X)计算题
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1.提第二个里的x
你就明白了!
(x-2)(x+2)x-(x+2)(x-2)x=0
原试=(x-2)(x+2)x-(x+2)(x-2)x
=(X²-4)x-(X²-4)x
=0
(X-2)(X²+2X)—(X+2)(X²-2X)
=(X-2)(X+2)X - (X+2)(X-2)X
=0
把X提取出来 得 x(X-2)(X+2)-- X(X+2)(X-2)=0
=0