求大神帮帮忙吧!!!
1个回答
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你第一题抄错了,正确答案如下:
(c²-b²+d²-a²)²-4(ab-cd)²
=[(c²-b²+d²-a²)+2(ab-cd)][(c²-b²+d²-a²)-2(ab-cd)]
=[(c²-2cd+d²)-(a²-2ab+b²)][(c²+2cd+d²)-(a²+2ab+b²)]
=[(c-d)²-(a-b)²][(c+d)²-(a+b)²]
=(c-d+a-b)(c-d-a+b)(c+d+a+b)(c+d-a-b)
第二题你应该也抄错了,y=3.14
原式
=-2(x+y/2)²
=-2X(3.43+1.57)²
=-2X25
=-50
(c²-b²+d²-a²)²-4(ab-cd)²
=[(c²-b²+d²-a²)+2(ab-cd)][(c²-b²+d²-a²)-2(ab-cd)]
=[(c²-2cd+d²)-(a²-2ab+b²)][(c²+2cd+d²)-(a²+2ab+b²)]
=[(c-d)²-(a-b)²][(c+d)²-(a+b)²]
=(c-d+a-b)(c-d-a+b)(c+d+a+b)(c+d-a-b)
第二题你应该也抄错了,y=3.14
原式
=-2(x+y/2)²
=-2X(3.43+1.57)²
=-2X25
=-50
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