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数学
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若3^x=12,3^y=4,则9^x-y=
谢谢
人气:485 ℃ 时间:2020-06-26 08:30:51
解答
9^(x-y)
=(3^2)^(x-y)
=3^(2x-2y)
=3^2x÷3^2y
=(3^x)^2÷(3^y)^2
=12^2÷4^2
=144÷16
=9
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3(x-y)^2-12(x-y)^2+9帮帮忙啊啊.我很急^O^
解二元一次方程组x/2+y/3=9 x-y=12
x\2+3\y=9,x-y=12解方程
3y=2x y/3=x/2 12/x=9/y y/x=?y/x=?x/y=?
2元一次方程2分之X+3分之Y=9 X-Y=12
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