Toán Lớp 8: Rút gọn biểu thức:
a) (x-1).(x+1) -5x.(x+3)
b) (x-4). (x+3) – (x-y$)^{2}$
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Toán Lớp 8: Rút gọn biểu thức:
a) (x-1).(x+1) -5x.(x+3)
b) (x-4). (x+3) – (x-y$)^{2}$
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