已知x=7.21,y=2.79,求1/2x^2+xy+1/2y^2的值
来源:学生作业帮助网 编辑:作业帮 时间:2024/09/10 20:20:33
![已知x=7.21,y=2.79,求1/2x^2+xy+1/2y^2的值](/uploads/image/z/3002676-60-6.jpg?t=%E5%B7%B2%E7%9F%A5x%3D7.21%2Cy%3D2.79%2C%E6%B1%821%2F2x%5E2%2Bxy%2B1%2F2y%5E2%E7%9A%84%E5%80%BC)
x){}K+lu*m-uml273Ү*㌞jyڰ&HDv6d7~[FP]% VծԄO Y
S YF 1R0aH
"Ǽ ;%-240 tp
已知x=7.21,y=2.79,求1/2x^2+xy+1/2y^2的值
已知x=7.21,y=2.79,求1/2x^2+xy+1/2y^2的值
已知x=7.21,y=2.79,求1/2x^2+xy+1/2y^2的值
原式=1/2(x²+2xy+y²)
=1/2(x+y)²
=1/2×(7.21+2.79)²
=1/2×10²
=50
1/2x^2+xy+1/2y^2
=1/2(x²+2xy+y²)
=1/2(x+y)²
=1/2×(7.21+2.79)²
=1/2×10²
=50
1/2x^2+xy+1/2y^2
=1/2(x^2+2xy+y^2)
=1/2(x+y)²
=1/2*(7.21+2.79)²
=1/2*100
=50