Toán A. 4x( 5x^2 -2x +3) B. X(4x^3 – 5xy +2x) C. 89^2 +22.89+11^2 21/07/2021 By Hailey A. 4x( 5x^2 -2x +3) B. X(4x^3 – 5xy +2x) C. 89^2 +22.89+11^2
`A = 4x.(5x^2-2x+3)` `=20x^3+8x^2+12x` `B=x(4x^3-5xy+2x)` `=4x^4-5x^2y+2x^2` `C = 89^2+22.89+11^2` `=89^2+2.11.89+11^2` `=(89+11)^2=100^2=10000` Trả lời
`A = 4x.(5x^2-2x+3)`
`=20x^3+8x^2+12x`
`B=x(4x^3-5xy+2x)`
`=4x^4-5x^2y+2x^2`
`C = 89^2+22.89+11^2`
`=89^2+2.11.89+11^2`
`=(89+11)^2=100^2=10000`