初中代数,求高手问题如图,求详细步骤,谢谢
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初中代数,求高手问题如图,求详细步骤,谢谢
初中代数,求高手
问题如图,求详细步骤,谢谢
初中代数,求高手问题如图,求详细步骤,谢谢
1,原式=3²×1.2²-4²×1.4²
=(3×1.2)²-(4×1.4)²
=3.6²-5.6²
=(3.6+5.6)(3.6-5.6)
=9.2×(-2)
=-18.4
2,原式=(2abc)²-(a+b-c)²
=[2abc+(a+b-c)][2abc-(a+b-c)]
=(2abc+a+b-c)(2abc-a-b+c)
3,原式=x²(x-y)-y²(x-y)
=(x-y)(x²-y²)
=(x-y)(x-y)(x+y)
=(x+y)(x-y)²
4,原式=[2(x-5)]²-[5(x+1)]²
=(2x-10)²-(5x+5)²
=[(2x-10)+(5x+5)][(2x-10)-(5x+5)]
=(2x-10+5x+5)(2x-10-5x-5)
=(7x-5)(-3x-15)
=-3(7x-5)(x+5)
望采纳
9×1.2²-16×1.4²=(3×1.2)²-(4×1.4)²=(3.6+5.6)×(3.6-5.6)=9.2×(-2)=-18.4
=(3x1.2)²-(4x1.4)² =(3.6+5.6)x(3.6-5.6) =9.2x(-2) =-18.4 =x²(x-y)-y²(x-y) =(x-y)(x²-y²) =(x-y)²(x+y) =(2abc)²-(a+b-c)² =(2abc-a-b+c)(2abc+a+b-c) =[2(x-5)]²-[5(x+1)]² 【希望帮助到你,若有疑问,可以追问~~~祝你学习进步,更上一层楼!(*^__^*)】
=[(2x-10)+(5x+5)][(2x-10)-(5x+5)]
=(2x-10+5x+5)(2x-10-5x-5)
=(7x-5)(-3x-15)
=3(5-7x)(x+5)