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P. TRANSFORMATION
52. The eagle is behind my back. >> My back is in front of the eagle
53. What subjects do you ? << What 's your favourite subject ?
54. The river is on the left of my house. >> My house is on the right of the river
55. What is your address? >> where is your house?
<< 56. It's quarter to twelve now. >> It's eleven-forty minutes now
<< 57. How much does she weigh? >> What does she 's weigh ?
<< 58. How do you do. >> What is your job ?
<< 59. I go to school by bike. >> I ride a bike to school .
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1/10 < x/19 > 7/57
=>57/570 < 30x/570 < 70/570
=>57 < 30x < 70
=> x=2
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Bài 2: Tìm x
a, \(7x\left(x-10\right)=0\)
\(\Rightarrow x\left(x-10\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x=0\\x-10=0\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=0\\x=10\end{matrix}\right.\)
b, \(\left(4-x\right)\left(2x+6\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}4-x=0\\2x+6=0\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=4\\x=-3\end{matrix}\right.\)
c, \(-12\left(x-5\right)+7\left(3-x\right)=5\)
\(\Rightarrow-12x+60+21-7x=5\)
\(\Rightarrow-19x=5-60-21\)
\(\Rightarrow-19x=-76\Rightarrow x=4\)
Chúc bạn học tốt!!!
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\(36+\left(-4\right)+64+\left(-58\right)\)
\(\Leftrightarrow\left(36+64\right)+[\left(-4\right)+\left(-58\right)]\)
\(\Leftrightarrow100+\left(-62\right)\)
\(=38\)
\(2+\left(-4\right)+6+\left(-8\right)+.......+2016+\left(-2018\right)\)
\(\Leftrightarrow\left(2018-2\right):2=1008\)( TÍNH SỐ SỐ HẠNG)
\(\Leftrightarrow1008:2=504\)
\(\Leftrightarrow[2+\left(-4\right)].504\)
\(\Leftrightarrow\left(-2\right).504=-1008\)
# chúc bạn học tốt #
Câu 1
36 + ( - 4 ) + 64 + ( -58 )
= ( 36 + 64 ) + ( -4- 58 )
= 100 + ( - 62 )
= 38
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a)x=60
B)x=1;19
c)X=0;34;68;102;136;170
d)x=15;17
e)x=0;15;30;45;60;75;90
f)x=12;16;24;32;48;96
g)x=75;165.255;345;.... khoảng cách giữa các số là 90
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Bài 1:Tính
a, \(-57\left(75-36\right)-75\left(36-57\right)-57\left(75-36\right)-75\left(36-57\right)\)
\(=-114\left(75-36\right)-150\left(36-57\right)\)
\(=-144.39-150.\left(-21\right)\)
\(=-5616+3150=-2466\)
b, \(19-42\left(-19\right)+38.5\)
\(=19+42.19+19.2.5\)
\(=19.\left(1+42+10\right)=19.53=1007\)
Chúc bạn học tốt!!!
![](https://rs.olm.vn/images/avt/0.png?1311)
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