作业帮30道整式的运算练习题快,我很急,最好到答案
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30道整式的运算练习题快,我很急,最好到答案
30道整式的运算练习题
快,我很急,最好到答案
30道整式的运算练习题快,我很急,最好到答案
（x2+ax+b)(x2-3x+4)
=x^4-3x^3+4x^2+ax^3-3ax^2+4ax+bx^2-3bx+4b
=x^4-(3-a)x^3+(4-3a+b)x^2+(4a-3b)+4b
3-a=0 => a=3
4-3a+b=0
4-3*3+b=0
b=5
设任取0-9中3个数X,Y,Z.
6个两位数分别是：10X+Y,10Y+X,10X+Z,10Z+X,10Y+Z,10Z+Y.
6个数相加,和是22X+22Y+22Z=22(X+Y+Z).
再除以（X+Y+Z）等于22.
所以不管X,Y,Z如何,最终结果都是22.
1)(x-y)(x+3) (2)
(3)(5a2+8a)+(3a2-7a+5) (4)(-3)5•(-3)2•3
(5) (6)x2y2•(-x2y)
(7)(2a+3b)(a-b) (8)(5a3-2a+a2)÷(-2a)
a的平方*b^3ab+5*a的平方*b@4ab
=a^2*(b+3ab)+5a^2*(b-4ab)
=a^2b+3a^3b+5a^2b-20a^3b
=6a^2b-17a^3b
=6*(5^2)*3-17*(5^3)*3
=5895
(2x^2)^3-6x^3(x^3+2x^2+x)
=(8x^6)-(6x^6+12x^5+6x^4)
=8x^6-6x^6-12x^5-6x^4
=2x^6-12x^5-6x^4
2
(x+y+z)(x+y-z)
=(x+y)^2 - z^2
=x^2 + y^2 -2xy -z^2
3
[(x+y)^2-(x-y)^2]÷(2xy)
=[x^2 + 2xy + y^2 -(x^2 - 2xy + y^2)]/(2xy)
=[x^2 + 2xy + y^2 - x^2 + 2xy - y^2)]/(2xy)
=(4xy)/(2xy)
=2
4
a^2 (a+1)^2-2(a^2-2a+4)
=a^2[a^2 + 2a +1]-(2a^2-4a+8)
=a^4 + 2a^3 + a^2 - 2a^2 + 4a -8
=a^4 + 2a^3 - a^2 + 4a - 8