来自陈静杰的问题
2(r+1)(r+1)+(r+1)=34128有数学老师会解不?帮个忙用公式法加计算器可得129.3794或-131.8794
2(r+1)(r+1)+(r+1)=34128有数学老师会解不?帮个忙
用公式法加计算器可得129.3794或-131.8794
1回答
2020-03-16 01:44
2(r+1)(r+1)+(r+1)=34128有数学老师会解不?帮个忙用公式法加计算器可得129.3794或-131.8794
2(r+1)(r+1)+(r+1)=34128有数学老师会解不?帮个忙
用公式法加计算器可得129.3794或-131.8794
原式=2(r²+2r+1)+r+1=2r²+4r+2+2r+2=2r²+6r+4=(r²+4r+4)+r²+2r=(r+2)²+r²+2r不会……