Vậy \(x=14\)

1+1=2

\(\left(x-12\right).17=34\)

\(\Rightarrow x-12=34:17\)

\(\Rightarrow x-12=2\)

\(\Rightarrow x=2+12\)

\(\Rightarrow x=14\)

EX1:

1. D. Writer

2. B. Month
EX2:

1. A. More expensive

2. B. In

3. C. Cartoon

4. B. How much

5. C. With

6. B. Would

7. A. A - the

8. B. Will be

9. D. Finishes

10. D. Went

\(y^2=-2\left(x^6-x^3y-32\right)\)

\(\Leftrightarrow2x^6-2x^3y+y^2=64\)

\(\Leftrightarrow4x^6-4x^3y+2y^2=128\)

\(\Leftrightarrow\left(2x^3-y\right)^2+y^2=128\)

Áp dụng bất đẳng thức sau: \(A^2+B^2\ge\dfrac{\left(A+B\right)^2}{2}\), ta có:

\(\left(2x^3-y\right)^2+y^2\ge\dfrac{\left(2x^3-y+y\right)^2}{2}=2x^6\)

\(\Leftrightarrow128\ge2x^6\Leftrightarrow x^6\le64\)

\(\Leftrightarrow-2\le x^2\le2\)

Vậy \(x\in\left\{-2;-1;0;1;2\right\}\)

phép tính đâu bạn

\(x^2+y^2=3-xy\)

\(\Leftrightarrow\left(x-y\right)^2=3.\left(1-xy\right)\)

\(\Leftrightarrow x-y=3\) và \(1-xy=3\)

\(\Leftrightarrow\left(x;y\right)=\left(1;-2\right),\left(2;-1\right),\left(-1;2\right),\left(-2;1\right)\)

hoặc \(x-y=0\) và \(1-xy=0\)

\(\Leftrightarrow\left(x;y\right)=\left(1;1\right),\left(-1;-1\right)\)

1. How much money was the house worth?

2. Molly was waking up at 6.30 a.m yesterday to have breakfast.

3. I like studying William, but I don't like geography.

4. The thief stole the jewelry worth $10,000.

5. Ronald doesn't know which club to join.

\(900500+3000=903500\)

\(6550313+1000=6551313\)

\(987603+5000=992603\)

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