(-1\3m+3\4n)(1\3m+3\4n),(a平方+b平方)(a平方-b平方)(a四次方+b的四次方)怎么做
问题描述:
(-1\3m+3\4n)(1\3m+3\4n),(a平方+b平方)(a平方-b平方)(a四次方+b的四次方)怎么做
答
解1题原式=(-1/3m+3/4n)(1/3m+3/4n)=(3/4n-1/3m)(3/4n+1/3m)=(3/4n)²-(1/3m)²=9/16n²-1/9m²解2题原式=(a²+b²)(a²-b²)(a^4+b^4)=(a^4-b^4)(a^4+b^4)=a^8-b^8