Y=(30+X-25)(230-10X)化简
2个回答
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Y=(30+X-25)(230-10X)
Y=(X+5)(230-10X)-10x
Y=-10x²-50x+230x+1150
Y=-10x²+180x+1150
Y=(X+5)(230-10X)-10x
Y=-10x²-50x+230x+1150
Y=-10x²+180x+1150
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展开全部
y=(x+5)·[-10(x-23)]
=-10(x+5)(x-23)
=-10(x²-23x+5x-115)
=-10(x²-18x-115)
=-10[x²-18x+(18/2)²-(18/2)²-115]
=-10(x²-18x+81-196)
=-10(x-9)² + 1960
=-10(x+5)(x-23)
=-10(x²-23x+5x-115)
=-10(x²-18x-115)
=-10[x²-18x+(18/2)²-(18/2)²-115]
=-10(x²-18x+81-196)
=-10(x-9)² + 1960
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