BÀI TẬP BUỔI 3: TÌM X Bài 1 : Tìm x: a) (x-34).15=0 b) 18.(x-16)=18 c) (x-55).17=0 d) 25.(x-75)=25 e) 7.(2x+1)=21 f) 4.(3x-2)=16 Bài 2 Tìm x: a) (x-34)-15=0 b) 18-(x-16)=18 c) (x-55)-17=0 d) 25-(x-75)=25 e) 7+(2x+1)=21 f) 4+(3x-2)=16 Bài 3: Tìm x: a) (x-3)-120=0 b) 156-(x+61)=82 c) 96-3(x+1)=42 d) 124+(118-x)=217 e) (x-25)-115=10+5 f) 541+(218-x)=735 g) 125+(145-x)=175 h) 435+(6x-8)=457 i) 96-3(x+1)=42 Bài 4: Tìm x: a) 151-2(x-6)=2227:17 b) 12(x-1):3=64-8 c) 60-(x:6+4)=54 d) 25+25.x=64+36 e) 5x-36:18=13 f) (5x-36):18=13 g) 7+(2x+1)=21 h) 4+(3x-2)=16 i) 12x-33=9.27 Bài 5 Tìm x: a) 1+2x=15 b) 13-4x=5 c) 2(x+1)-3=9 d)10-3(12-x)=1 e) 62-(2x-3):3=13 f) 71+(26-3x):2=13 g) 71+(26-3x):2=75 h) 25+68(5x+7)=29 i) 15:(4x-7)+28=4:(4x-7)+39 Bài 6: Tìm x a) x+2x=15 b) 5x-4x=5 c) x+8x=9 d) [(10-x).2+5]:3-2=3 e) 2<x<5 f) x<10 g) 3 9x ≤ ≤ h) 4 11x≤ ≤ i) 0 5x ≤ ≤ BÀI TẬP BUỔI 3: TÌM X Bài 1 : Tìm x: g) (x-34).15=0 h) 18.(x-16)=18 i) (x-55).17=0 j) 25.(x-75)=25 k) 7.(2x+1)=21 l) 4.(3x-2)=16 Bài 2 Tìm x: g) (x-34)-15=0 h) 18-(x-16)=18 i) (x-55)-17=0 j) 25-(x-75)=25 k) 7+(2x+1)=21 l) 4+(3x-2)=16 Bài 3: Tìm x: j) (x-3)-120=0 k) 156-(x+61)=82 l) 96-3(x+1)=42 m) 124+(118-x)=217 n) (x-25)-115=10+5 o) 541+(218-x)=735 p) 125+(145-x)=175 q) 435+(6x-8)=457 r) 96-3(x+1)=42 Bài 4: Tìm x: j) 151-2(x-6)=2227:17 k) 12(x-1):3=64-8 l) 60-(x:6+4)=54 m) 25+25.x=64+36 n) 5x-36:18=13 o) (5x-36):18=13 p) 7+(2x+1)=21 q) 4+(3x-2)=16 r) 12x-33=9.27 Bài 5 Tìm x: d) 1+2x=15 e) 13-4x=5 f) 2(x+1)-3=9 d)10-3(12-x)=1 e) 62-(2x-3):3=13 f) 71+(26-3x):2=13 g) 71+(26-3x):2=75 h) 25+68(5x+7)=29 i) 15:(4x-7)+28=4:(4x-7)+39 Bài 6: Tìm x j) x+2x=15 m) [(10-x).2+5]:3-2=3 p) 3 9x ≤ ≤ k) 5x-4x=5 l) x+8x=9 n) 2<x<5 o) x<10 q) 4 11x≤ ≤ r) 0 5x ≤ ≤ BÀI KIỂM TRA SỐ 1 Hä vµ tªn häc sinh: C©u 1 (4.5 ®iÓm) Thùc hiÖn c¸c phÐp tÝnh a) 22.47 + 2.38.11 + 15.22 b) 80 - (4.25-7.8) c) 23.75+25.23 +180 d) 80- (4.25 – 3.8) e) 80- (4.25 – 3.8) f) 2448: [119 – (23 -6)] + (51- 49) g) [1570 – 4.(25.19 – 25. 9)] : [2. (27- 8)] h) 2x17x16+36x21+8x4x62 i) 32x25+32x75+68x79+68x21 C©u 2 (4.5 ®iÓm)T×m x a) x – 72 : 9 = 7.4 d) 231 – (x -6) = 1339 : 13 b). (x + 4) = 121 – 7.3 e) [(6.x - 39) : 3] .79 =395 c) (5x – 5 ).2 =60 C©u 3 (1 ®iÓm) TÝnh tæng: a) A=1+2+3+4+ .+100 b) B = 5 + 10 +15 +–. + 1995 + 2000 + 2005 BÀI KIỂM TRA SỐ 1 Hä vµ tªn häc sinh: C©u 1 (4.5 ®iÓm) Thùc hiÖn c¸c phÐp tÝnh a) 22.47 + 2.38.11 + 15.22 b) 80 - (4.25-7.8) c) 23.75+25.23 +180 d) 80- (4.25 – 3.8) e) 80- (4.25 – 3.8) f) 2448: [119 – (23 -6)] + (51- 49) g) [1570 – 4.(25.19 – 25. 9)] : [2. (27- 8)] h) 2x17x16+36x21+8x4x62 i) 32x25+32x75+68x79+68x21 C©u 2 (4.5 ®iÓm)T×m x a) x – 72 : 9 = 7.4 d) 231 – (x -6) = 1339 : 13 b). (x + 4) = 121 – 7.3 e) [(6.x - 39) : 3] .79 =395 c) (5x – 5 ).2 =60 C©u 3 (1 ®iÓm) TÝnh tæng: a) A=1+2+3+4+ .+100 b) B = 5 + 10 +15 +–. + 1995 + 2000 + 2005 BÀI KIỂM TRA SỐ 1 Hä vµ tªn häc sinh: C©u 1 (4.5 ®iÓm) Thùc hiÖn c¸c phÐp tÝnh a) 22.47 + 2.38.11 + 15.22 b) 80 - (4.25-7.8) c) 23.75+25.23 +180 d) 80- (4.25 – 3.8) e) 80- (4.25 – 3.8) f) 2448: [119 – (23 -6)] + (51- 49) g) [1570 – 4.(25.19 – 25. 9)] : [2. (27- 8)] h) 2x17x16+36x21+8x4x62 i) 32x25+32x75+68x79+68x21 C©u 2 (4.5 ®iÓm)T×m x a) x – 72 : 9 = 7.4 d) 231 – (x -6) = 1339 : 13 b). (x + 4) = 121 – 7.3 e) [(6.x - 39) : 3] .79 =395 c) (5x – 5 ).2 =60 C©u 3 (1 ®iÓm) TÝnh tæng: T hêi gian : 45– T hêi gian : 45– T hêi gian : 45– a) A=1+2+3+4+ .+100 b) B = 5 + 10 +15 +–. + 1995 + 2000 + 2005 . 60 -(x :6+ 4) =54 d) 25+ 25. x =64 + 36 e) 5x - 36 :18= 13 f) (5x - 36 ):18= 13 g) 7+(2x+1)=21 h) 4+(3x-2)= 16 i) 12x -33 =9.27 Bài 5 Tìm x: a) 1+2x= 15 b) 13- 4x =5 c) 2(x+1) -3= 9 d)10 -3( 12-x)=1. 4 35 +(6x-8)= 457 r) 96 -3( x+1)=42 Bài 4: Tìm x: j) 151 -2(x -6) =2227:17 k) 12(x-1) :3= 64 -8 l) 60 -(x :6+ 4) =54 m) 25+ 25. x =64 + 36 n) 5x - 36 :18= 13 o) (5x - 36 ):18= 13 p) 7+(2x+1)=21