Ai giải giúp em với ạ đang cần gấp

`1.` `2x^2.(3x^3+2x)`

`=2x^2·3x^3+2x^2·2x`

`=6x^5+4x^3`

`---`

`2.` `3x.(x^2+2x+2)`

`=3x·x^2+3x·2x+3x·2`

`=3x^3+6x^2+6x`

`---`

`3.` `2/3x^3·(3x^4-2x^2+1)`

`=2/3x^3·3x^4+2/3x^3·(-2x^2)+2/3x^3·1`

`=2x^7-4/3x^5+2/3x^3`

`---`

`4.` `-3x^2·(x^2-1)`

`=-3x^2·x^2-3x^2·(-1)`

`=-3x^4+3x^2`

`---`

`5.` `(-10x^3+2/5y-1/2z).(-1/2xy)`

`=-10x^3·(-1/2xy)+2/5y·(-1/2xy)-1/2z·(-1/2xy)`

`=5x^4y-1/5xy^2+1/4xyz`

`---`

`6.` `x^2y(4xy+3y-5x)`

`=x^2y·4xy+x^2y·3x+x^2y·(-5x)`

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

`---`

`7)` `(-4/3xy)(3x^2y-6xy+9x)`

`=-4/3xy·3x^2y-4/3xy·(-6xy)-4/3xy·9x`

`=-4x^3y^2+8x^2y^2-12x^2y`