1、已知:3^5 *27^³=9^(m+1),化简后求代数式2m(m-1)-(m+2)(m-4)的值
3^5 *27^³=9^(m+1),
3^5 *(3³)^³=9^(m+1),
3^5 *3^9=9^(m+1),
3^(5+9)=9^(m+1),
3^14=9^(m+1),
(3²)^7=9^(m+1),
9^7=9^(m+1),
m+1=7
m=6;
2m(m-1)-(m+2)(m-4)
=2*6(6-1)-(6+2)(6-4)
=60-8*2
=60-16
=44
2、化简x-【2(1/4 x -1/3 y²)-(-3/2 x+1/3 y²)】
=x-x/2+2y²/3-3x/2+y²/3
=(1-1/2-3/2)x+(2/3+1/3)y²
=-2x+y²
=y²-2x
3、化简:(-2xy²)(3xy-4xy²+1)
=(2xy²)(4xy²-3xy-1)
[题目好像有问题]