`10` ví dụ về đơn thức đồng dạng là: `x^2y; 2x^2y; 3x^2y; 4x^2y; 5x^2y; 6x^2y; 7x^2y; 8x^2y; 9x^2y; 10x^2y`

`x^2y+2x^2y+3x^2y+4x^2y+5x^2y=15x^2y`

Đáp án+Giải thích các bước giải:

`10` ví dụ về các đơn thức đồng dạng là :

`bb1.`

`x^2` ; `3x^2` ; `5x^2`

`->x^2+3x^2+5x^2=(1+3+5)x^2=9x^2`

`bb2.`

`2x^3` ; `5x^3` 

`->2x^3+5x^3=(2+5)x^3=7x^3`

`bb3.`

`7x^2y` ; `8x^2y` ; `-4x^2y`

`->7x^2y+8x^2y+(-4x^2y)=[7+8+(-4)]x^2y=11x^2y`

`bb4.`

`8y^2` ; `9y^2` ; `2y^2` ; `6y^2`

`->8y^2+9y^2+2y^2+6y^2=(8+9+2+6)y^2=25y^2`

`bb5.`

`x^3yz^2` ; `4x^3yz^2` ; `-8x^3yz^2`

`->x^3yz^2+4x^3yz^2+(-8x^3yz^2)=[1+4+(-8)]x^3yz^2=-3x^3yz^2`

`bb6.`

`1/2xy` ; `4/7xy` ; `3xy`

`->1/2xy+4/7xy+3xy=(1/2+4/7+3)xy=(7/14+8/14+42/14)xy=57/14xy`

`bb7.`

`-7/2xy^2` ; `8xy^2` ; `-2xy^2` ; `9xy^2` ; `-3xy^2` ; `-4xy^2`

`->-7/2xy^2+8xy^2+(-2xy^2)+9xy^2+(-3xy^2)+(-4xy^2)`

`=[-7/2+8+(-2)+9+(-3)+(-4)]xy^2`

`=(-7/2+26/2-4/2+18/2-6/2-8/2)xy^2`

`=-19/2xy^2`

`bb8.`

`-23xz^2` ; `11xz^2`

`->-23xz^2+11x^2=(-23+11)xz^2=-12xz^2`

`bb9.`

`7xy^4z` ; `8xy^4z` ; `-9xy^4` ; `10xy^4` 

`->7xy^4+8xy^4+(-9xy^4)+10xy^4`

`=[7+8+(-9)+10]xy^4`

`=16xy^4`

`bb10.`

`2x` ; `23x` ; `4x` ; `13x` ; `x` ; `12x` ; `6x` ; `8x` ; `9x` ; `11x`

`->2x+23x+4x+13x+x+12x+6x+8x+9x+11x`

`=(2+23+4+13+1+12+6+8+9+11)x`

`=89x`

`#3years`