Toán Lớp 8: Rút gọn biểu thức:
B=(x-3)(x+3)-(x-3)²
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Toán Lớp 8: Rút gọn biểu thức:
B=(x-3)(x+3)-(x-3)²
Comments ( 2 )
B=x^2-3^2-(x^2-2.x.3+3^2)
B=x^2-9-(x^2-6x+9)
B=x^2-9-x^2+6x-9
B=(x^2-x^2)+(-9-9)+6x
B=-18+6x
B=6x-18
Vậy B=6x-18