Cho 2 đa thức M= 5x^2y-15xy^2+7x-3 N=x^2y-15xy^2+7x-1/2 Tính M-N 25/09/2021 Bởi Eliza Cho 2 đa thức M= 5x^2y-15xy^2+7x-3 N=x^2y-15xy^2+7x-1/2 Tính M-N
$#Dino$ `M-N=5x^2y-15xy^2+7x-3-(x^2y-15xy^2+7x-1/2)` `=5x^2y-15xy^2+7x-3-x^2y+15xy^2-7x+1/2` `=(5x²y-x²y)+(-15xy²+15xy²)+(7x-7x)+(-3+1/2)` `=4x²y-5/2` Bình luận
M-N = 5x^2y-15xy^2+7x-3 – ( x^2y-15xy^2+7x-1/2 ) = 5x^2y-15xy^2+7x-3 – x^2y+15xy^2-7x+1/2 = 4x^2y – 5/2 Bình luận
$#Dino$
`M-N=5x^2y-15xy^2+7x-3-(x^2y-15xy^2+7x-1/2)`
`=5x^2y-15xy^2+7x-3-x^2y+15xy^2-7x+1/2`
`=(5x²y-x²y)+(-15xy²+15xy²)+(7x-7x)+(-3+1/2)`
`=4x²y-5/2`
M-N = 5x^2y-15xy^2+7x-3 – ( x^2y-15xy^2+7x-1/2 )
= 5x^2y-15xy^2+7x-3 – x^2y+15xy^2-7x+1/2
= 4x^2y – 5/2