搜搜做题作业网◆初2数学题◆2道```````````速度
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◆初2数学题◆2道```````````速度
1,若x的m次方=3,x的n次方=6,则x的3m-2n次方=
2,已知3的n次方=2,3的m次方=5,求3的2n+m-1次方的值.
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◆注意要写过程◆要本人看的懂`
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1,若x的m次方=3,x的n次方=6,则x的3m-2n次方=
2,已知3的n次方=2,3的m次方=5,求3的2n+m-1次方的值.
```````````
◆注意要写过程◆要本人看的懂`
``` ◆
``◆` ◆
`◆`◆ ◆
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1.x^m=3,x^n=6,
x^(3m-2n)
=x^(3m)/x^(2n)
=(x^m)^3/(x^n)^2
=3^3/6^2
=27/36
=3/4.
2.3^n=2,3^m=5,
3^(2n+m-1)
=3^(2n)*3^m/3^1
=(3^n)^2*5/3
=2^2*5/3
=20/3.
x^(3m-2n)
=x^(3m)/x^(2n)
=(x^m)^3/(x^n)^2
=3^3/6^2
=27/36
=3/4.
2.3^n=2,3^m=5,
3^(2n+m-1)
=3^(2n)*3^m/3^1
=(3^n)^2*5/3
=2^2*5/3
=20/3.