Question

1.一块长为2a²b+b的3次方,宽为b的3次方-2a²b的长方形木板,若把它锯成4b²个

Answer 1

1、（2a^2b+b^3)(b^3-2a^2b)/4b^2=b(2a^2+b^2)*b(b^2-2a^2)/4b^2=b^2(b^4-4a^4)/4b^2=(b^4-4a^4)/42、（m-n）²（m+n）²（m²+n²）²=【（m-n)(m+n)]^2(m^2+n^2)=（m^2-n^2)^2(m^2+n^2)^2=(m^...