计算1.(π-2√3)+π+√3 2.(x+y)(x²-xy+y²) 3.2(m+1)²-(2m+1)(2m-1)
问题描述:
计算1.(π-2√3)+π+√3 2.(x+y)(x²-xy+y²) 3.2(m+1)²-(2m+1)(2m-1)
答
1.(π-2√3)+π+√3 原式=π-2√3+π+√3=2π-√32.(x+y)(x²-xy+y²)原式=x³-x²y+xy²+x²y-xy²+y³=x³+y³3.2(m+1)²-(2m+1)(2m-1)原式=2(m²+2m+...