作业帮1.(x-y)^3(y-x)^2(x-y)(y-x)^52.4^x=2^x+3,则x=?3楼的还有一题的说！
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1.(x-y)^3(y-x)^2(x-y)(y-x)^52.4^x=2^x+3,则x=?3楼的还有一题的说！
1.(x-y)^3(y-x)^2(x-y)(y-x)^5
2.4^x=2^x+3,则x=?
3楼的还有一题的说！
1.(x-y)^3(y-x)^2(x-y)(y-x)^52.4^x=2^x+3,则x=?3楼的还有一题的说！
啊呀呀,好简单哟~
(1)(x-y)^3(y-x)^2(x-y)(y-x)^5
∵y-x=-(x-y)
(y-x)^2=[-(x-y)]^2=(x-y)^2 （负负得正嘛~）
(y-x)^5=[-(x-y)]^5=-(x-y)^5（奇次方时负数还是负数,偶次方时负数变正数）
∴(x-y)^3(y-x)^2(x-y)(y-x)^5
=-(x-y)^3(x-y)^2(x-y)(x-y)^5
=-(x-y)^11
(2)4^x=2^x+3 (貌似是高一学的指数函数哟~）
∵4^x=(2^2)^x=2^2x
∴2^2x=2^x+3
设：2^2x为k^2,2^x为k
∴k^2=k+3
∴k^2-k-3=0
k1=（1+根号13）/2
k2=（1-根号13）/2
x^2=（1+根号13）/2或（1-根号13）/2
∴x=根号k~(不写了~你应该会分母有理化的吧~）
（你们那么早就学这个啦,感觉好像是题目出错了）
^是什么意思？
1.(x-y)^3(y-x)^2(x-y)(y-x)^5
题目不明
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