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\(a,\dfrac{2}{3}+\dfrac{1}{3}\times x^2=\left(-2\right)^0\)
\(\dfrac{2}{3}+\dfrac{1}{3}\times x^2=1\)
\(\dfrac{1}{3}\times x^2=1-\dfrac{2}{3}\)
\(\dfrac{1}{3}\times x^2=\dfrac{1}{3}\)
\(x^2=\dfrac{1}{3}:\dfrac{1}{3}\)
\(x^2=1\)
\(\Rightarrow x=\pm1\)
\(\dfrac{2}{3}+\dfrac{1}{3}.x^2=\left(-2\right)^0\)
\(\Leftrightarrow\dfrac{1}{3}.x^2=1-\dfrac{2}{3}\)
\(\Leftrightarrow\dfrac{1}{3}x^2=\dfrac{1}{3}\)
\(\Leftrightarrow x^2=1\)
\(\Leftrightarrow\left|x\right|=1\)
\(\Leftrightarrow\left[{}\begin{matrix}x=1\\x=-1\end{matrix}\right.\)
a: =-5/7(2/11+9/11)+12/7
=12/7-5/7
=7/7=1
b: \(=\dfrac{-12}{56}+\dfrac{35}{56}-\dfrac{28}{56}=\dfrac{-5}{56}\)
c: \(=\dfrac{1}{4}-\dfrac{5}{13}+\dfrac{2}{11}-\dfrac{8}{13}+\dfrac{3}{4}\)
=1-1+2/11
=2/11
d: \(=\dfrac{21}{31}+\dfrac{-16}{7}+\dfrac{44}{53}+\dfrac{10}{31}+\dfrac{9}{53}\)
=1+1-16/7
=-2/7
e: \(=\dfrac{\dfrac{4}{36}-\dfrac{30}{36}-\dfrac{144}{36}}{\dfrac{21}{36}-\dfrac{1}{36}-\dfrac{360}{36}}=\dfrac{-160}{-340}=\dfrac{8}{17}\)
a) −512−512 . 419419 +−712−712 . 419419 -40574057 Đầu tiên, chúng ta tính toán phép nhân: −512 x 419419 = -214,748,928 −712 x 419419 = -298,238,328
Tiếp theo, chúng ta tính tổng của hai kết quả: -214,748,928 + -298,238,328 = -513,987,256
Cuối cùng, chúng ta trừ đi 40574057: -513,987,256 - 40574057 = -554,561,313
Vậy kết quả của phép tính a là -554,561,313.
b) 1313 . 4545 + 1313.1.1515 + ( −32−32 )^2 Đầu tiên, chúng ta tính toán phép nhân: 1313 x 4545 = 5,964,385 1313 x 1.1515 = 1,511.195 −32 x −32 = 1,024
Tiếp theo, chúng ta tính tổng của ba kết quả: 5,964,385 + 1,511.195 + 1,024 = 5,966,920.195
Vậy kết quả của phép tính b là 5,966,920.195.
\(c`3,4.0,7+3,4.0,3-0,4=3,4.\left(0,7+0,3\right)-0,4=3,4.10-0,4=34-0,4=33,6\)
\(d`\left(1-\dfrac{1}{2}+\dfrac{3}{4}\right)-\left(\dfrac{1}{2}+1\dfrac{3}{4}-3\right)=\left(1-\dfrac{1}{2}+\dfrac{3}{4}\right)-\left(\dfrac{1}{2}+\dfrac{7}{4}-3\right)=1-\dfrac{1}{2}+\dfrac{3}{4}-\dfrac{1}{2}-\dfrac{7}{4}+3=\left(1+3\right)+\left(-\dfrac{1}{2}-\dfrac{1}{2}\right)+\left(\dfrac{3}{4}-\dfrac{7}{4}\right)=4+\left(-1\right)+\left(-1\right)=2\)
IX.
1.. the toystore is to the left of the restaurant. RIGHT
the restaurant is to the right of the toystore
2. the hospital is behid the museum . FRONT
the museum is in front of the hospital
3. there is a small garden in my school . HAS
my school has a small garden
4. david's house isn't far from the station . NEAR
David's house is near the station
5. the bookstore is to the left of the toystore and to the right of the police station . BETWEEN
the bookstore is between the toystore and the police station
1. The toystore is to te left of the restaurant (RIGHT)
\(\Rightarrow\)The restaurant is to the right of the toystore.
2. The hospital is behind the museum (FRONT)
\(\Rightarrow\)The museum is frontof the hospital.
3. There is a small garden in my school (HAS)
\(\Rightarrow\)My school has a small garden.
4. David's house isn't far from the station (NEAR)
\(\Rightarrow\)David's house is near the station.
5. The bookstore is to the left of the toystore and to the right of the police station (BETWEEN)
\(\Rightarrow\)The bookstore is between the toystore and the police station.
Phong Thien k phải ý Hồng Phúc Nguyễn nói bn là bên này học tiếng anh, bn nên đăng sang toán....
Đây là tiếng anh ==