Toán tính Q(x), biết P(x)+Q(x)=2x^2+12 P(x)=2x^2+3x 26/07/2021 By aikhanh tính Q(x), biết P(x)+Q(x)=2x^2+12 P(x)=2x^2+3x
P(x)+Q(x)=2x^2+12 Q(x)=2x^2+12-P(x) Q(x)=2x²+12-(2x²+3x) Q(x)=2x²+12-2x²-3x Q(x)=(2x²-2x²)-3x+12 Q(x)=-3x+12 Trả lời
`P(x)+Q(x)=2x^{2}+12` Mà `P(x)=2x^{2}+3x` `=>2x^{2}+3x+Q(x)=2x^{2}+12` `=>Q(x)=2x^{2}+12-(2x^{2}+3x)` `=>Q(x)=2x^{2}-2x^{2}+12-3x` `=>Q(x)=12-3x` Vậy `Q(x)=12-3x` Trả lời
P(x)+Q(x)=2x^2+12
Q(x)=2x^2+12-P(x)
Q(x)=2x²+12-(2x²+3x)
Q(x)=2x²+12-2x²-3x
Q(x)=(2x²-2x²)-3x+12
Q(x)=-3x+12
`P(x)+Q(x)=2x^{2}+12`
Mà `P(x)=2x^{2}+3x`
`=>2x^{2}+3x+Q(x)=2x^{2}+12`
`=>Q(x)=2x^{2}+12-(2x^{2}+3x)`
`=>Q(x)=2x^{2}-2x^{2}+12-3x`
`=>Q(x)=12-3x`
Vậy `Q(x)=12-3x`