Câu 2: C
Xét bộ `11cm; 7cm; 18cm` ta có:
`11+7= 18 => 3` điểm tạo được `3` đoạn thẳng là `3` điểm thẳng hàng
`=>` Không thể là `3` cạnh của `1Δ`
Câu 3: D
Thay `x= 2` vào biểu thức `x^3+2x^2-3` ta có:
`2^3+2.2^2-3`
`= 8+2.4-3`
`= 8+8-3`
`= 13`
2.ý C
vì một cạnh lớn nhất của tam giác luôn luôn nhỏ hơn tổng
=>a+b>c
mà 11+7=18
=>C ko phải là độ dài của ba cạnh tam giác
3.ý D
thay x=2 vào bt trên ta có:
2³+2.2²-3
=8+2.4-3
=8+8-3
=16-3
=13
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phân tích đa thức thành nhân tử a,(a+1)(a+3)(a+4)(a+2)=15 b,x(x+3)(x+1)(x+2)+1 dùng phương pháp dồn biến
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