①诺代数式y^2+2y+7的值是6,则代数式4y^2+8y-5的值是( ) ②诺2^m=3,4^n=8,则2^3m-2n+3的值是( )↓③诺x^2+3x-1=0,则x^3+5x^2+5x+18的值为( )④诺x^2+4y^2+6x+4y+10=0,求y^x的值.⑤对于算式2(3+1)(3^2+1)(3^4
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/25 17:07:22
![①诺代数式y^2+2y+7的值是6,则代数式4y^2+8y-5的值是( ) ②诺2^m=3,4^n=8,则2^3m-2n+3的值是( )↓③诺x^2+3x-1=0,则x^3+5x^2+5x+18的值为( )④诺x^2+4y^2+6x+4y+10=0,求y^x的值.⑤对于算式2(3+1)(3^2+1)(3^4](/uploads/image/z/1090187-35-7.jpg?t=%E2%91%A0%E8%AF%BA%E4%BB%A3%E6%95%B0%E5%BC%8Fy%5E2%2B2y%2B7%E7%9A%84%E5%80%BC%E6%98%AF6%2C%E5%88%99%E4%BB%A3%E6%95%B0%E5%BC%8F4y%5E2%2B8y-5%E7%9A%84%E5%80%BC%E6%98%AF%EF%BC%88+%EF%BC%89+%E2%91%A1%E8%AF%BA2%5Em%3D3%2C4%5En%3D8%2C%E5%88%992%5E3m-2n%2B3%E7%9A%84%E5%80%BC%E6%98%AF%28+%EF%BC%89%E2%86%93%E2%91%A2%E8%AF%BAx%5E2%2B3x-1%3D0%2C%E5%88%99x%5E3%2B5x%5E2%2B5x%2B18%E7%9A%84%E5%80%BC%E4%B8%BA%EF%BC%88+%EF%BC%89%E2%91%A3%E8%AF%BAx%5E2%2B4y%5E2%2B6x%2B4y%2B10%3D0%2C%E6%B1%82y%5Ex%E7%9A%84%E5%80%BC.%E2%91%A4%E5%AF%B9%E4%BA%8E%E7%AE%97%E5%BC%8F2%EF%BC%883%2B1%EF%BC%89%EF%BC%883%5E2%2B1%EF%BC%89%EF%BC%883%5E4)
①诺代数式y^2+2y+7的值是6,则代数式4y^2+8y-5的值是( ) ②诺2^m=3,4^n=8,则2^3m-2n+3的值是( )↓③诺x^2+3x-1=0,则x^3+5x^2+5x+18的值为( )④诺x^2+4y^2+6x+4y+10=0,求y^x的值.⑤对于算式2(3+1)(3^2+1)(3^4
①诺代数式y^2+2y+7的值是6,则代数式4y^2+8y-5的值是( ) ②诺2^m=3,4^n=8,则2^3m-2n+3的值是( )↓
③诺x^2+3x-1=0,则x^3+5x^2+5x+18的值为( )
④诺x^2+4y^2+6x+4y+10=0,求y^x的值.
⑤对于算式2(3+1)(3^2+1)(3^4+1)(3^8+1)(3^16+1)(3^32+1)+1.
(1):不用计算器,你能计算出来吗?
(2):你知道他计算的结果是几位数吗?个位是几?
⑥如图1,OC平分∠AOB,反向延长OC到点D,反向延长OA到点E,∠3=25°,求∠BOE的度数.
所有题都要算出来,所有题都算出来以后,我会再加分的.
请大家把全部问题都回答上来!1
①诺代数式y^2+2y+7的值是6,则代数式4y^2+8y-5的值是( ) ②诺2^m=3,4^n=8,则2^3m-2n+3的值是( )↓③诺x^2+3x-1=0,则x^3+5x^2+5x+18的值为( )④诺x^2+4y^2+6x+4y+10=0,求y^x的值.⑤对于算式2(3+1)(3^2+1)(3^4
①代数式y^2+2y+7的值是6,则代数式4y^2+8y-5的值是(-9 ) ②诺2^m=3,4^n=8,则2^3m-2n+3的值是( 27)③诺x^2+3x-1=0,则x^3+5x^2+5x+18的值为( 20)
④诺x^2+4y^2+6x+4y+10=0,求y^x的值.
﹙x+3﹚²+﹙2y+1﹚²=0
∴x=-3,y=-1/2
y^x=-8
⑤对于算式2(3+1)(3^2+1)(3^4+1)(3^8+1)(3^16+1)(3^32+1)+1.
(1):不用计算器,你能计算出来吗?
2(3+1)(3^2+1)(3^4+1)(3^8+1)(3^16+1)(3^32+1)+1
=﹙3-1﹚(3+1)(3^2+1)(3^4+1)(3^8+1)(3^16+1)(3^32+1)+1
=3^64-1+1=3^64
(2):你知道他计算的结果是几位数吗?他计算的结果是几位数几?
他计算的结果是31位数,个位是1.
⑥如图1,OC平分∠AOB,反向延长OC到点D,反向延长OA到点E,∠3=25°,求∠BOE的度数.
↓
∠BOE的度数180º-2×25º=130º.