Question

初一数学题，急急急急急急急急~！！！速度啊！跪求帮助！~~

最好能在下午2点前做出来啊！！！急急急
1. x^3n=2 ，求x^6n+x^2n·x^10n

2. x+4y-3=0 求2^x·16^y

3. 16^2m÷4^m乘4^3m-3n+1

4.（x+1）^2n-1（-x-y)^6+(x+y)^3+n(x+y)n+2
(x+1)^2n+1 (-x-y)^6 + (x+y)^3+n (x+y)^n+2

(x+1)^2n+1 和(-x-y)^6 是相乘的
(x+y)^3+n 和(x+y)^n+2是相乘的

(x+1)^2n+1 (-x-y)^6 和 (x+y)^3+n (x+y)^n+2中间加号

Answer 1

1 求x^6n+x^2n·x^10n
x^6n+x^2n·x^10n
=（x^3n）^2+(x^3n）^4
=4+16
=20
2 求2^x·16^y
2^x·16^y
= 2^x·*2^4y
2^( x+4y)
=2^3
=8
3 16^2m÷4^m* 4^3m-3n+1
=4^(4m-m)*4^3m-3n+1
=4^6m+ 2-3n
4^m乘4^3m有括号吗 ？
如果有就是
=4^4m÷(4^m*4^3m)-3n+1
=4^4m÷4^4m-3n+1
=2-3n

4题重新写一下！

追问

没括号

追答

3 16^2m÷4^m* 4^3m-3n+1
=4^(4m-m)*4^3m-3n+1
=4^6m+ 1-3n

4、
（x+1）^2n-1（-x-y)^6+(x+y)^3+n(x+y)n+2
=(x+1)^2n-1(x+y)^6+(x+y)^(3+n+n+2)
=(x+1)^2n-1(x+y)^6+(x+y)^(2n+5)
那个（x+1）应该是（x+y）吧 我感觉你写错了！
（x+y)^2n-1 (-x-y)^6 + (x+y)^3+n (x+y)^n+2
=(x+y)^（2n+5）+(x+y)^（2n+5）
=2（x+y)^（2n+5）

Answer 2

1.
x^6n+x^2n*x^10n=x^6n+x^12n=(x^3n)^2+(x^3n)^4=4+16=20

2.
x+4y-3=0 x+4y=3
2^x*16^y=2^x*(2^4)^y=2^x*2^4y=2^(x+4y)=2^3=8

3.
16^2m÷4^m乘4^3m-3n+1
=(4^2)^2m÷4^m乘4^3m-3n+1
=4^4m÷4^m乘4^3m-3n+1
=4^3m乘4^3m-3n+1
=4^6m-3n+1

4.
（x+1）^2n-1（-x-y)^6+(x+y)^3+n(x+y)n+2
=(x+1)^2n-1(x+y)^6+(x+y)^(3+n+n+2)
=(x+1)^2n-1(x+y)^6+(x+y)^(2n+5)

Answer 3

1. x^3n=2 ，求x^6n+x^2n·x^10n
x^6n+x^2n·x^10n
= （x^3n）^2+x^12n
=2^2+（x^3n）^4
=4+2^4
=4+16
=20

2. x+4y-3=0 求2^x·16^y
2^x·16^y
=2^x2^4y
=2^(x+4y)
=2^3
=8

3. 16^2m÷4^m乘4^3m-3n+1
=4^4m÷(4^m乘4^3m)-3n+1
=4^4m÷4^4m-3n+1
=2-3n

4.（x+1）^2n-1（-x-y)^6+(x+y)^3+n(x+y)n+2
~~~~是相乘吗？ ~~~~~~~这里好像少了个符号
这题有问题

Answer 4

1. x^6n+x^2n·x^10n=x^3n*x^3n+x^12n=4+16=20
2. 2^x·16^y=2^x*2^4y=2^(x+4y)=2^3=8
3. 16^2m÷4^m乘4^3m-3n+1=256^m/4^m*64^m-3n+1=4^6m-3n+1
4.

Answer 5

1、x^6n+x^2n·x^10n
=(x^3n)^2+x^12n
=(x^3n)^2+(x^3n)^4
=4+16
=20

2、因为x+4y-3=0
所以x+4y=3
2^x·16^y
=2^x·2^4y
=2^(x+4y)
=2^3
=8

3、16^2m÷4^m×4^(3m-3n+1)
=4^4m÷4^m×4^(3m-3n+1)
=4^(4m-m+3m-3n+1)
=4^(6m-3n+1)

4、第四题你写清楚点再给你做吧