第三大题的1 2小题
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9(1)
X平方+3X+2
=X平方+3X+3-1
=(X平方-1)+(3X+3)
=(x+1)(X-1)+3(X+1)
=(X+1)(X-1+3)
=(X+1)(X+2)
(2)2X平方+5X-3
=2(X平方+5/2X-3/2)
=2(X平方+5/2X-9+15/2)
=2(X平方-9+5/2X+15/2)
=2(X+3)(x-3)+5X+15
=2(X+3)(x-3)+5(X+3)
=(x+3)(2X-6+5)
=(x+3)(2X-1)
X平方+3X+2
=X平方+3X+3-1
=(X平方-1)+(3X+3)
=(x+1)(X-1)+3(X+1)
=(X+1)(X-1+3)
=(X+1)(X+2)
(2)2X平方+5X-3
=2(X平方+5/2X-3/2)
=2(X平方+5/2X-9+15/2)
=2(X平方-9+5/2X+15/2)
=2(X+3)(x-3)+5X+15
=2(X+3)(x-3)+5(X+3)
=(x+3)(2X-6+5)
=(x+3)(2X-1)
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