Đáp án: m≥1/2
Giải thích các bước giải:
∆=b^2-4ac=(2m+2)^2-4.1.(m^2+2)=4m^2+8m+4-4m^2-8=8m-4
để pt có 2 nghiệm pb x1;x2
=>∆≥0
<=> 8m-4≥0
<=>m≥1/2
Vậy m≥1/2 để pt có 2 nghiệm pb x1;x2
Đáp án:m>1/2
Denta=[2(m+1)]2-4(m2+2)=4m2+8m+4-4m2-8=8m-4
Để pt có 2 nghiện phân biệt thì denta>0
=>8m-4>0
<=>m>1/2
My gấp được số bông hoa là số nhỏ nhất có hai chữ số pha gấp được 1phần 2 số bông hoa của my
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