作业帮下列各式计算正确的是：1,-a^6*(-a)^2=-a^8.2,(-2)^5=-10.3,(x^5)^5=x^10.4,m^4+m^4=2m^8.5,(2mn^2)^3*mn^3=8m^4*n^9.6,(3ab)^3-9a^3b^3=0计算：(1.3*10^5)*(3.8*10^3)=4x^2y*(-xy^2)^3+6x^2*3x^3y^7=a^3*a^4*a+(a^2)^4+(-2a^4)^2=[2ab^2*(-3ab)]^2=(-2x^
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/05 04:48:48
![下列各式计算正确的是：1,-a^6*(-a)^2=-a^8.2,(-2)^5=-10.3,(x^5)^5=x^10.4,m^4+m^4=2m^8.5,(2mn^2)^3*mn^3=8m^4*n^9.6,(3ab)^3-9a^3b^3=0计算：(1.3*10^5)*(3.8*10^3)=4x^2y*(-xy^2)^3+6x^2*3x^3y^7=a^3*a^4*a+(a^2)^4+(-2a^4)^2=[2ab^2*(-3ab)]^2=(-2x^](/uploads/image/z/7211624-32-4.jpg?t=%E4%B8%8B%E5%88%97%E5%90%84%E5%BC%8F%E8%AE%A1%E7%AE%97%E6%AD%A3%E7%A1%AE%E7%9A%84%E6%98%AF%EF%BC%9A1%2C-a%5E6%2A%28-a%29%5E2%3D-a%5E8.2%2C%28-2%29%5E5%3D-10.3%2C%28x%5E5%29%5E5%3Dx%5E10.4%2Cm%5E4%2Bm%5E4%3D2m%5E8.5%2C%282mn%5E2%29%5E3%2Amn%5E3%3D8m%5E4%2An%5E9.6%2C%283ab%29%5E3-9a%5E3b%5E3%3D0%E8%AE%A1%E7%AE%97%EF%BC%9A%281.3%2A10%5E5%29%2A%283.8%2A10%5E3%29%3D4x%5E2y%2A%28-xy%5E2%29%5E3%2B6x%5E2%2A3x%5E3y%5E7%3Da%5E3%2Aa%5E4%2Aa%2B%28a%5E2%29%5E4%2B%28-2a%5E4%29%5E2%3D%5B2ab%5E2%2A%28-3ab%29%5D%5E2%3D%28-2x%5E)
下列各式计算正确的是：1,-a^6*(-a)^2=-a^8.2,(-2)^5=-10.3,(x^5)^5=x^10.4,m^4+m^4=2m^8.5,(2mn^2)^3*mn^3=8m^4*n^9.6,(3ab)^3-9a^3b^3=0计算：(1.3*10^5)*(3.8*10^3)=4x^2y*(-xy^2)^3+6x^2*3x^3y^7=a^3*a^4*a+(a^2)^4+(-2a^4)^2=[2ab^2*(-3ab)]^2=(-2x^
下列各式计算正确的是：1,-a^6*(-a)^2=-a^8.2,(-2)^5=-10.3,(x^5)^5=x^10.4,m^4+m^4=2m^8.5,(2mn^2)^3*mn^3=8m^4*n^9.6,(3ab)^3-9a^3b^3=0
计算：(1.3*10^5)*(3.8*10^3)=
4x^2y*(-xy^2)^3+6x^2*3x^3y^7=
a^3*a^4*a+(a^2)^4+(-2a^4)^2=
[2ab^2*(-3ab)]^2=
(-2x^2y^3)^2*(-3xy^2)=
试着说明代数式：（2x+3）*（3x+2）-6x(x+3)+5x+6的值与x的取值无关.
已知（2x-6）*（3x^2+ax-4)展开后不含x^2项,求a的值.
下列各式计算正确的是：1,-a^6*(-a)^2=-a^8.2,(-2)^5=-10.3,(x^5)^5=x^10.4,m^4+m^4=2m^8.5,(2mn^2)^3*mn^3=8m^4*n^9.6,(3ab)^3-9a^3b^3=0计算：(1.3*10^5)*(3.8*10^3)=4x^2y*(-xy^2)^3+6x^2*3x^3y^7=a^3*a^4*a+(a^2)^4+(-2a^4)^2=[2ab^2*(-3ab)]^2=(-2x^
1,-a^6*(-a)^2=-a^8.(√)
2,(-2)^5=-10.(X)
3,(x^5)^5=x^10.(X)
4,m^4+m^4=2m^8.(X)
5,(2mn^2)^3*mn^3=8m^4*n^9.(X)
6,(3ab)^3-9a^3b^3=0(X).
计算：(1.3*10^5)*(3.8*10^3)=(1.3×3.8)×(10^5×10^3)=4.94×10^8.
4x^2y*(-xy^2)^3+6x^2*3x^3y^7=4X^7Y^7+18X^5Y^7.
a^3*a^4*a+(a^2)^4+(-2a^4)^2=a^8+a^8+4a^8=6a^8.
[2ab^2*(-3ab)]^2=[18a^3b^4]^2=324a^6b^8.
(-2x^2y^3)^2*(-3xy^2)=(4x^4Y^6)*(-3XY^2)=-12X^5Y^8,
试着说明代数式：（2x+3）*（3x+2）-6x(x+3)+5x+6的值与x的取值无关.
原式=6X^2+13X+6-6X^2-18X+5X+6
=(6-6)X^2+(13-18+5)X+12
=12,
∴原式与X无关.
已知（2x-6）*（3x^2+ax-4)展开后不含x^2项,求a的值.
(2X-6)(3X^2+aX-4)
=6X^3+(2a-18)X-(6a+8)X+24
不含X^2项,∴2a-18=0,
a=9.
（x+y)^2=x^2+2xy+y^2=7^2+2*(- 8)=49-16=33 x^2+y^2=（x+y)^2-2xy=49+16=65(x-y)^2=x^2+y^2-2xy=(x+y)^2- 4xy=49+32=81 由(x-y)^2=81得 x-y=9 或x-y=-9 x=8，y=-1 或x=-2，y=9(因为xy=-8，不合题意舍 去) 所以：x^2-y^2=(x+y)(x- y)=7*（...
全部展开
（x+y)^2=x^2+2xy+y^2=7^2+2*(- 8)=49-16=33 x^2+y^2=（x+y)^2-2xy=49+16=65(x-y)^2=x^2+y^2-2xy=(x+y)^2- 4xy=49+32=81 由(x-y)^2=81得 x-y=9 或x-y=-9 x=8，y=-1 或x=-2，y=9(因为xy=-8，不合题意舍 去) 所以：x^2-y^2=(x+y)(x- y)=7*（8+1）=7*9=632(2x^3-3x^2y-2y^2)-（4x^3- 6x^2y+y^2） =4x^3-6x^2y-4y^2-4x^3+6x^2y-y^2 =-5y^2 结果里y是平方 这样y是2和-2时，y平方是一样的 所以结果也对
收起