计算1.(π-2√3)+π+√3 2.(x+y)(x²-xy+y²) 3.2(m+1)²-(2m+1)(2m-1)

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计算1.(π-2√3)+π+√3 2.(x+y)(x²-xy+y²) 3.2(m+1)²-(2m+1)(2m-1)

计算1.(π-2√3)+π+√3 2.(x+y)(x²-xy+y²) 3.2(m+1)²-(2m+1)(2m-1)
计算1.(π-2√3)+π+√3 2.(x+y)(x²-xy+y²) 3.2(m+1)²-(2m+1)(2m-1)

计算1.(π-2√3)+π+√3 2.(x+y)(x²-xy+y²) 3.2(m+1)²-(2m+1)(2m-1)
1.(π-2√3)+π+√3
原式=π-2√3+π+√3
=2π-√3
2.(x+y)(x²-xy+y²)
原式=x³-x²y+xy²+x²y-xy²+y³
=x³+y³
3.2(m+1)²-(2m+1)(2m-1)
原式=2(m²+2m+1)-(4m²-1)
=2m²+4m+2-4m²+1
=-2m²+4m+3