Đáp án + Giải thích các bước giải:
`A=|2x-0,4|-(12)/(5)`
Vì `|2x-0,4|>=0` với mọi `x`
`->|2x-0,4|-(12)/(5)>= -(12)/(5)` với mọi `x`
Dấu `=` xảy ra khi :
`2x-0,4=0`
`->2x=0,4`
`->x=0,2`
Vậy `min_A=-(12)/(5)` khi `x=0,2`
Đáp án:
Giải thích các bước giải:
`|2x-0.4|-12/5`
Ta có: `|2x-0.4| >=0 AA x`
`=>|2x-0.4| -12/5 >=-12/5 AA x`
Dấu "=" xảy ra khi:
`2x-0.4=0 `
`<=>2x=0.4`
`<=>x=1/5`
Vậy `A_(min)=-12/5` khi `x=1/5`
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Tìm n ∈ N để: ( 3n-4 ) chia hết (n-5)
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Tìm x nguyên để biểu thức A nguyên
5. Although he was tired, he finished doing his homework. A. In spite his tiredness, he finished doing his homework. B. In spite of his tiredness, he finished doing his homework. C. In spite of he was tired, he finished doing his homework. D. In spite his tired, he finished doing his homework. 6. My sister failed the exam because she was lazy. A. Because my sister’s laziness, she failed the exam. B. Because of my sister’s laziness, she failed the exam. C. Because of my sister was lazy, she failed the exam. D. Because of my sister laziness, she failed the exam. 7. Although they are poor, they are very generous. A. In spite of their poverty, they are very generous. B. In spite of their poor, they are very generous. C. In spite of they are poor, they are very generous. D. In spite of their poverty but they are very generous.
tìm x,y nguyên thỏa mãn: (y-1)^2(x+y+1)= (y+1)^2
Giải giúp mình câu này: Chứng minh đẳng thức (x-y)(x^3+x^3+x^2y+xy^2+y^3)=x^4-y^4
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