规定AⓧB=3A+2B,如果xⓧ(5ⓧ2)=74,那么x=( )规定AⓧB=3A+2B,如果xⓧ(5ⓧ2)=74,那么x=( )
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![规定AⓧB=3A+2B,如果xⓧ(5ⓧ2)=74,那么x=( )规定AⓧB=3A+2B,如果xⓧ(5ⓧ2)=74,那么x=( )](/uploads/image/z/10082247-15-7.jpg?t=%E8%A7%84%E5%AE%9AA%26%239447%3BB%3D3A%2B2B%2C%E5%A6%82%E6%9E%9Cx%26%239447%3B%285%26%239447%3B2%29%3D74%2C%E9%82%A3%E4%B9%88x%3D%EF%BC%88+%EF%BC%89%E8%A7%84%E5%AE%9AA%26%239447%3BB%3D3A%2B2B%2C%E5%A6%82%E6%9E%9Cx%26%239447%3B%285%26%239447%3B2%29%3D74%2C%E9%82%A3%E4%B9%88x%3D%EF%BC%88+%EF%BC%89)
规定AⓧB=3A+2B,如果xⓧ(5ⓧ2)=74,那么x=( )规定AⓧB=3A+2B,如果xⓧ(5ⓧ2)=74,那么x=( )
规定AⓧB=3A+2B,如果xⓧ(5ⓧ2)=74,那么x=( )
规定AⓧB=3A+2B,如果xⓧ(5ⓧ2)=74,那么x=( )
规定AⓧB=3A+2B,如果xⓧ(5ⓧ2)=74,那么x=( )规定AⓧB=3A+2B,如果xⓧ(5ⓧ2)=74,那么x=( )
5ⓧ2=3*5+2*2=15+4=19
∴xⓧ(5ⓧ2)
=xⓧ19
=3x+2*19
=74
3x=36
x=12
(5 2)=3*5+2*2=19
(x 19)=3x+2*19=74
3x=74-38=36
x=36/3=12
x=12
因为: A: 5ⓧ2=3x5+2x2=19
xⓧA=3x(x)+Ax2=(x)x3+2x19=74
所以:x=12