(x+5)²-(x-2)(x-3) =x²+10x+25-(x²-5x+6) *5x怎么来的
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(x+5)²-(x-2)(x-3) =x²+10x+25-(x²-5x+6) *5x怎么来的
(x+5)²-(x-2)(x-3) =x²+10x+25-(x²-5x+6) *5x怎么来的
(x+5)²-(x-2)(x-3) =x²+10x+25-(x²-5x+6) *5x怎么来的
(x+5)²-(x-2)(x-3)
=x²+10x+25-(x²-3x-2x+6)
=x²+10x+25-(x²-5x+6)
=x²+10x+25-x²+5x-6
=15x+19