1.3^(2a+3y)=(3^a)^2×(3^y)^3=ab
2.2^(m-n)=2^m÷2^n=8÷5=1.6
3.(m-1/3)(m的平方+1/9)(m+1/5)=(m-1/3)(m+1/3)(m+1/3)(m+1/5)
=(m-1/3)^2(m+1/3)(m+1/5)=(m+1/3)^2(m+1/3)(m+1/5)=(m+1/3)^3(m+1/5)
4.(x+y+z)(x+y-z)=〔(x+y)+z〕〔(x+y)-z〕=(x+y)^2-z^2=x^2+2xy+y^2-z^2
5.(x-y)=1.5^4=5.0625
我想你的第五题打错了吧,不然第一个条件就没有用
第三题我只能解到这了,你看着办