因式分解 10X-4.9X方= X(X-2)+X-2= 4x方-1+= (X-4)方-(5-2x)方=
人气:224 ℃ 时间:2020-04-11 01:10:21
解答
10X-4.9X方=x(10-4.9x)
X(X-2)+X-2=(x-2)(x+1)
4x方-1=(2x+1)(2x-1)
(X-4)方-(5-2x)方=(x-4-5+2x)(x-4+5-2x)=(3x-9)(1-x)=3(x-3)(1-x)
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