I/know/him/since/we/be/primary students
Kho 1 chứa số tấn gạo là
`121/(3+8) xx 3 = 33 (tấn)`
Kho 2 chứa số tấn gạo là
`121 - 33 = 88(tấn)`
\(\dfrac{1}{2^2}< \dfrac{1}{1\cdot2}\\ \dfrac{1}{3^2}< \dfrac{1}{2\cdot3}\\ \dfrac{1}{4^2}< \dfrac{1}{3\cdot4}\\ ...\\ \dfrac{1}{50^2}< \dfrac{1}{49\cdot50}\\ \Rightarrow A=\dfrac{1}{1^2}+\dfrac{1}{2^2}+\dfrac{1}{3^2}+\dfrac{1}{4^2}+...+\dfrac{1}{50^2}< 1+\dfrac{1}{1\cdot2}+\dfrac{1}{2\cdot3}+\dfrac{1}{3\cdot4}+...+\dfrac{1}{49\cdot50}\\ \Rightarrow A< 1+1-\dfrac{1}{2}+\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{4}+...+\dfrac{1}{49}-\dfrac{1}{50}\\ \Rightarrow A< 2-\dfrac{1}{50}< 2\)
`41 - (2.x - 5) = 3^2`
`41 - (2.x - 5) = 9`
`2.x-5=41-9`
`2.x-5=32`
`2.x=32+5`
`2.x=37`
`x=37:2`
`x=18,5`
\(41-\left(2x-5\right)=3^2=9\)
=> 2x - 5 = 41 - 9 = 32
=> 2x = 32 + 5 = 37
=> x = 37/2
`41-(2x -5) = 3^2`
`<=> 2x-5 = 41 -3^2 =41-9`
`<=> 2x-5 =32`
`<=> 2x = 32+5=37`
`=> x=37/2`
VI . Rewrite the following sentences without changing their original meanings.
-> Your father _____should not drink so much wine_____________________________________
6 . Getting up early every day is good for your health
-> You ___________you get up early every day_____________________________
9 . It's good for you to take exercise every day.
-> You ___________should take exercise every day_____________________________
10 . It's very important not to drink the water there. It will make you ill
-> You ____________should not drink the water there because it will make you ill____________________________
`2^3 + 2 . { 12 + 2 . [ 3 xx ( 5 - 2) + 1]} + 1`
`=2^3 + 2 . { 12 + 2 . [ 3 xx 3 + 1]} + 1`
`=2^3 + 2 . { 12 + 2 . [ 9 + 1 ]} + 1`
`=2^3 + 2 . { 12 + 2 . 10 +1}`
`=2^3 + 2 . { 12 + 20 + 1}`
` = 2^3 + 2 . 33`
`=8 + 2 . 33`
`= 8 + 66`
`= 74`
`12/19 . 7/15 . (-13)/17 . 19/12 . 17/13`
`=(12/19 . 19/12) . ( (-13)/17 . 17/13) . 7/15`
`= 1 . (-1) . 7/15`
`= -1 . 7/15`
`=-7/15`
`12/19 * 7/15 * (-13)/17 * 19/12 * 17/13`
`= (12/19 * 19/12)* ( (-13)/17 * 17/13) * 7/15`
`=1* (-1)* 7/15`
` = (-1) * 7/15 = -7/15`