phan tich da thuc thanh nhan tu a) 49.(y-4)^2-9.(y+2)^2 b)x^4+x^3+x+1 C)x^2y+xy^2-x-y 15/08/2021 Bởi Josie phan tich da thuc thanh nhan tu a) 49.(y-4)^2-9.(y+2)^2 b)x^4+x^3+x+1 C)x^2y+xy^2-x-y
`a) 49(y-4)^2 -9.(y+2)^2` `=[7(y-4)+3(y+2)][7(y-4)-3(y+2)]` `=(7y-28+3y+6)(7y-28-3y-6)` `=(10y-22)(4y+34)` `=2(5y-11)2(2y+17)` `=4(5y-11)(2y+17)` `b) x^4 +x^3 +x+1` `=(x^4 +x^3)+(x+1)` `=x^3 (x+1)+(x+1)` `=(x+1)(x^3 +1)` `c) x^2 y+xy^2 -x-y` `=(x^2 y+xy^2)-(x+y)` `=xy(x+y)-(x+y)` `=(x+y)(xy-1)` chúc học tốt Bình luận
`a) 49.(y-4)^2-9.(y+2)^2` `=7^2(y-4)^2-3^2(y+2)^2` `=(7y-28)^2-(3y+6)^2` `=(7y-28-3y-6)(7y-28+3y+6)` `=(4y-34)(10y-22)` `=4(2y-17)(5y-11)` `b)x^4+x^3+x+1` `=x^3(x+1)+(x+1)` `=(x+1)(x^3+1)` `=(x+1)(x+1)(x^2-x+1)` `=(x+1)^2(x^2-x+1)` `C)x^2y+xy^2-x-y` `=xy(x+y)-(x+y)` `=(x+y)(xy-1)` Bình luận
`a) 49(y-4)^2 -9.(y+2)^2`
`=[7(y-4)+3(y+2)][7(y-4)-3(y+2)]`
`=(7y-28+3y+6)(7y-28-3y-6)`
`=(10y-22)(4y+34)`
`=2(5y-11)2(2y+17)`
`=4(5y-11)(2y+17)`
`b) x^4 +x^3 +x+1`
`=(x^4 +x^3)+(x+1)`
`=x^3 (x+1)+(x+1)`
`=(x+1)(x^3 +1)`
`c) x^2 y+xy^2 -x-y`
`=(x^2 y+xy^2)-(x+y)`
`=xy(x+y)-(x+y)`
`=(x+y)(xy-1)`
chúc học tốt
`a) 49.(y-4)^2-9.(y+2)^2`
`=7^2(y-4)^2-3^2(y+2)^2`
`=(7y-28)^2-(3y+6)^2`
`=(7y-28-3y-6)(7y-28+3y+6)`
`=(4y-34)(10y-22)`
`=4(2y-17)(5y-11)`
`b)x^4+x^3+x+1`
`=x^3(x+1)+(x+1)`
`=(x+1)(x^3+1)`
`=(x+1)(x+1)(x^2-x+1)`
`=(x+1)^2(x^2-x+1)`
`C)x^2y+xy^2-x-y`
`=xy(x+y)-(x+y)`
`=(x+y)(xy-1)`