1. There (be).................. thirty-nine students in my class. 2. What you (do)............... now? I (read)................. an English book. 3. He (play).................... soccer with his freinds after school? 4. How often Mai (go)...................... fishing? 5. They (not be)................. teachers in my school. 6. Mai (not do)............... her homework after school. 7. How long you (stay)...................... in Hue? For a week. 8. When she (have).................... English? 9. They (wait).................... for a train at the moment. 10. Look! the snow (fall)................ 11. We (be).............. tired and we would like some drinks. 12. Lan (have).................. an oval face and a small nose.

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1) Tim x biet: a. 575 - ( 6x + 70 ) = 445 d. ( x - 47 ) - 115 = 0 b. 315 + ( 125 - x ) = 435 e. 315 + ( 146 - x ) = 401 c. 6x -5 = 613 f. ( x - 36 ) : 18 = 12 LUY THUA 1) Viet gon cac tich sau bang cach dung luy thua: a. 7. 7. 7 b. 7. 38. 7. 25 c. 2. 3. 8. 12 d. x. x. y. y. x. y. x e. 1000. $10^{2}$. 10 2) Viet ket qua phep tinh duoi dang mot luy thua a. $3^{15}$ : $3^{5}$ b. $9^{8}$ c. $125 : 5^{2}$ d. $7^{5}$ : 343 e. $a^{12}$ : $a^{8}$ f. $x^{7}$ g. $2^{5}$. $2^{3}$. $2^{4}$ 3) Tim so tu nhien n biet rang: a. $2^{n}$ = 16 d. $7^{n}$ = 49 b. $4^{n}$ = 64 e. 50 < $2^{n} < 100 c. $15^{n}$ = 225 f. $5^{n}$ = 625 4 ) Tim so tu nhien x ma: a. $x^{50}$ = x b. 125 = $x^{3}$ c. 64 = $x^{2}$ d. 90 = 10. $3^{x}$ 5) Tim so tu nhien x biet: a. 100 - 7 ( x - 5 ) = 31 + $3^{3}$ b. 12 ( x - 1 ) : 3 = $4^{3}$ = $2^{3}$ c. 24 + 5 x = $7^{5}$ : $7^{3}$ d. 5x - 206 = $2^{4}$ THU TU THUC HIEN PHEP TINH Dang I: Thuc hien phep tinh : 1. 4. $5^{2}$ - 18 : $3^{2}$ 2. $3^{2}$. 22 - $3^{2}$. 19 3. $2^{4}$. 5 - [ 131 - ( 13 - 4 ) ² ] 4. 100 : { 250 : [ 450 - 4. $5^{3}$ - $2^{2} . 25 )]} 5 . $2^{3}$ . 15 - [ 115 - ( 12-5 ) ² ] 6. 30 . { 175 : [ 355 - ( 135 + 37. 5 )]} 7. 160 - ( $2^{3}$. $5^{2}$ - 6. 25 8. 5871 : [ 928 - ( 247 - 82 ) . 5 ] 9. 132 - [ 116 - ( 132 - 128 ) ² 10. 16 : { 400 : [ 200 - ( 37 + 46 . 3 )]} 11. { 1184 : [ 96 - 124 : 31 ] -2 } . 3651 12. 46 - [( 16 + 71 . 4 ) : 15 ] - 2 13. {[ 126 - ( 36 -31 ) ² . 2 ] -9 } . 1001 14. 315 - [( 60 - 41 ) ² - 361 ] . 4217 + 2885 15. [( 46 - 32 ) ² - ( 54 - 42 ) ² ] . 36 - 1872 16. [( 14 + 3 ) . 2 - 5 ] . 91 - 325 Dang II: Tim x la so tu nhien biet : a. ( x -6 ) ² = 9 b. 128 -3 ( x + 4 ) = 23 c. [( 14 + 28 ) . 3 + 55 ] : = 35 d. ( 12x - $4^{3} $ ) . $8^{3}$ = 4 . $8^{4}$ e. 720 : [ 41 - ( 2x - 5 )] = $2^{3}$ . 5 Cac bn oi giup mk nha nhanh nha de ti nua em ho mk di hoc roi mk nop cho thay ko thi thay danh chet the nhe giup mk di xin do mk cam on cac bn truoc nha