(4x^2y) ×(2x^3y^2)=(4×2)×(x^2×X^3)×(y×y^2) ( )=8x^5y^3 ( )(-2xy^2)(-xy)-(-3xy^2)^2 =2x^2y^4-9x^2y^4 ( )-7x^2y^4 ( ) 在括号内填上运算依据
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(4x^2y)×(2x^3y^2)=(4×2)×(x^2×X^3)×(y×y^2)()=8x^5y^3()(-2xy^2)(-xy)-(-3xy^2)^2=2x^2y^4-9x^2y^4()-7x^2
(4x^2y) ×(2x^3y^2)=(4×2)×(x^2×X^3)×(y×y^2) ( )=8x^5y^3 ( )(-2xy^2)(-xy)-(-3xy^2)^2 =2x^2y^4-9x^2y^4 ( )-7x^2y^4 ( ) 在括号内填上运算依据
(4x^2y) ×(2x^3y^2)
=(4×2)×(x^2×X^3)×(y×y^2) ( )
=8x^5y^3 ( )
(-2xy^2)(-xy)-(-3xy^2)^2
=2x^2y^4-9x^2y^4 ( )
-7x^2y^4 ( )
在括号内填上运算依据
(4x^2y) ×(2x^3y^2)=(4×2)×(x^2×X^3)×(y×y^2) ( )=8x^5y^3 ( )(-2xy^2)(-xy)-(-3xy^2)^2 =2x^2y^4-9x^2y^4 ( )-7x^2y^4 ( ) 在括号内填上运算依据
答:
(4x^2y) ×(2x^3y^2)
=(4×2)×(x^2×X^3)×(y×y^2) ( 乘法结合律 )
=8x^5y^3 ( 同底数幂相乘,底数不变,指数相加 )
(-2xy^2)(-xy)-(-3xy^2)^2
=2x^2y^4-9x^2y^4 ( 同底数幂相乘,底数不变,指数相加 )
=-7x^2y^4 ( 合并同类型 )
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
(x+y)/2- x-y/2=6 3(x+y)=4(x-y)
x+y/3+x-y/2=6 4(x+y)-2(x-y)=40
2(x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5
已知2y-x=-3,求[4y(2x-y)-2x(2x-y)]/(2x-y
x+y+2(-x-y+1)=3(1-y-x)-4-(y+x-1),x+y=?
先化简 再求值 (2x-y)(y+x)-(x-2y)(2y+x)-(-3y+x)^2其(√x+1)+y^2+4=-4y
(x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一