Question

1.数学选择题

若3的x+1次方=a，3的y-1次方=b，则3的x+y次方=（ ）
Aa.b Ba+b c3的a+b次方 D3的a.b次方 要过程谢谢！

Answer 1

3^(x+1)=3^x*3=a
3^x=a/3
3^(y-1)=3^y /3=b
3^y=3b
3^(x+y)=3^x*3^y=a/3*3b=ab
选择A

Answer 2

3^(x+1)=3×3^x=a
3^x=a/3
3^(y-1)= 3^y/3=b
3^y=3b
3^(x+y)=3^x×3^y=(a/3)(3b)=ab
选A

Answer 3

D3的a.b次方
D的a.b次方=(3的x+1次方)乘以(3的y-1次方)=3的(x+1+y-1)次方=3的x+y次方

Answer 4

A
3的X+1 乘以3的Y-1=3的X+Y=a.b

Answer 5

3^(x+1)=a，3^(y-1)=b，
3*3^x=a, 3^y/3=b
3^x=a/3, 3^y=3b
3的x+y次方=3^x*3^y=ab