Đáp án + Giải thích các bước giải:
Bài `2`:
a, `3xy - z - 3x + yz`
`= 3x(y - 1) + z(y - 1)`
`= (3x + z)(y - 1)`
b, `x^4 - 4x^3 - 3x^2 + 8x`
`= x(x^3 - 4x^2 - 3x + 8)`
c, Hằng đẳng thức `A^2 - B^2 = (A - B)(A + B)`
`x^2 - y^2 - 4x + 4y`
` = (x - y)(x + y) - 4(x - y)`
` = (x - y)(x + y - 4)`
xin hay nhất
Yoga increases endurance,____and flexibility. A. blood B. powerful C.strength D.strong
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