Question

三道数学题1、已知x的m+n次方=24,x的m次方=8,求x的3n次方的值2、已知x+5y=6,求x的2次方+30y+5

Answer 1

1.x^(m+n)=x^m*x^n=8*x^n=24

x^3n=(x^n)^3=3^3＝27

2.x=6-5y

＝(6-5y)^2+30y+5y(6-5y)=36-60y+25y^2+30y+30y-25y^2＝36