\(272+\left(146+x\right)=118\)

\(272+146+x=118\)

\(418+x=118\)

\(x=118-418\)

\(x=-300\)

Bài làm

a) 272+ ( 146 + x ) = 118

146 + x = 272 - 118

146 + x = 154

          x = 154 - 146

          x = 8

Vậy x = 8

b) 272 - ( 4.x + 15 )  = 45

4x + 15 = 272 - 45

4x + 15 = 227

4x         = 227 - 15

4x         = 112

  x         = 112 : 4

  x         = 28

Vậy x = 28

c) x - 36 : 18 = 16 

    x -      2      = 16

    x                = 18

Vậy x = 18

# Học tốt #

1>=> 146+x=-154

=>x=-300

2> => 4x+15=227

=>4x=212

=>x=53

37>=> x- 2=16

==>x=18

13 + 21.5 - (198 : 11 - 8)

= 13 + 105 - 10

= 108

272 : 16 - 5 +4 (30 - 5 - 255 : 17)

= 17 - 5 + 4. ( 30 - 5 - 15 )

= 16 . 10

= 160

15.24 - 14.5 (145 : 5 - 27)

= 360 - 70 ( 29 - 27 )

= 290 . 2

= 580

18.3 - 18.2 + 3 (51 : 17)

= 54 - 36 + 3 . 3

= 54 - 36 + 9

= 27

(64 + 115 + 36) - 25.8

= 215 - 200 

= 15

15.8 - (17 - 30 + 83) - 144 : 6

= 120 - 70 - 24

= 26

250 : 50 - (46 - 75 + 54) : 5

= 5 - 25 : 5 

= 5 - 5

= 0

13 (17 - 95 + 83) : 5 - 18 : 9

= 13. 5 : 5 - 2

= 65 : 5 - 2

= 13 - 2

= 11

140 - 180(47 - 90 + 43) + 7

= 140 - 180 . 0 + 7

= 140 + 7

= 147

24 (15 + 30 + 85 - 120):10

= 24. 10 : 10 

= 240 : 10

= 24

27 + 73 - 30 : (25 -10)

= 27 + 73 - 30 : 15

= 27 + 73 - 2

= 98

18 - 4 (27 - 90 + 73) : 10

= 18 - 4. 10 : 10

= 18 - 40 : 10

= 18 - 4

= 14

Bài 2: Tính

140 - [ 25 : (4 mũ 2 - 11) + 4 ]

= 140 - [25 : (16 - 11) + 4 ]

= 140 - [ 25 : 5 + 4 ]

= 140 - [ 5 + 4]

= 140 - 9 

= 131

Đáp án là:

a) 36*333-108*111

= 36*3*111-108*111

=108*111-108*111

=0

b) 136*68+16*272

=136*68+16*2*136

=136*68+32*136

=136*(68+32)

=136*100

=13600

a) 36*333 - 108*111

= 36*3*111 - 108*111

= 108*111 - 108*111

= 0

b) 136*68 + 16*272

= 136*68 + 16*2*136

= 136*68 + 32*136

= 136*(68 + 32)

= 136*100

= 13600

a) 36 . 333 - 108 . 111

= 36 . 3 . 111 - 108 . 111

= 108 . 111 - 108 . 111

= 0

b) 136 . 68 + 16 . 272

= 136 .  68 + 16 . 2 . 136

= 136 . 68  + 32 . 136

= 136 . ( 68 + 32 )

= 136 . 100

= 13600

2:

a: \(2^2\cdot3-4=4\cdot3-4=12-4=8\)

b: \(16-2^3\cdot2=16-2^4=16-16=0\)

c: \(4^2-4\cdot2=16-8=8\)

d: \(3^3-2\cdot3^2=27-2\cdot9=27-18=9\)

e: \(7^2-9\cdot2^2=49-9\cdot4=49-36=13\)

f: \(2^2\cdot3+4^2=4\cdot3+16=12+16=28\)

Bài 1:

a: \(13+21\cdot5-\left(198:11-8\right)\)

\(=13+105-18+8\)

=21+87

=108

b: \(272:16-5+4\cdot\left(30-5-255:17\right)\)

\(=17-5+4\cdot\left(30-5-15\right)\)

\(=12+4\cdot10=12+40=52\)

c: \(15\cdot24-14\cdot5\cdot\left(145:5-27\right)\)

\(=360-70\left(29-27\right)\)

=360-140

=220

d: \(18\cdot3-18\cdot2+3\cdot\left(\dfrac{51}{17}\right)\)

\(=18\left(3-2\right)+3\cdot3\)

=18+9

=27

e: \(64+115+36-25\cdot8\cdot6\cdot2^2\cdot3+4^2\)

\(=100+115-200\cdot6\cdot4\cdot3+16\)

\(=231-14400=-14169\)

f: \(15\cdot8-\left(17-30+83\right)-144:6\)

\(=120-24-\left(100-30\right)\)

=96-70

=26

a) 136 x 68 + 16 x 272 =  136 x 68 + 16 x 2 x 136  =  136 x 68 + 32 x 136 = 136 x ( 68 + 32 ) = 136 x 100 = 13600

b) 8 x 9 x14 + 6 x 17 x 12 + 19 x 4 x18 = 2 x 4 x9 x 14 + 6 x 17 x 4 x 3 + 19 x 4 x 18

= 56 x 18 + 18 x 68 + 76 x 18 = 18 x ( 56 + 68 + 76 ) = 18 x 200 = 3600

1)
a) \(34,2:36=0,95\)
b) \(36,18:18=2,01\)
c) \(5,05:25=0,202\)
d) \(17,25:75=0,23\)
2) 
a) \(75,52:32=2,36\)
b) \(4,68:13=0,36\)
c) \(81,6:34=2,4\)
d) \(134,4:42=3,2\)
3) 
a) \(882:36=24,5\)
b) \(78:24=3,25\)
c) \(3:15=0,2\)
d) \(15:75=0,2\)
4) 
a) \(3:75=0,04\)
b) \(750:300=2,5\)
c) \(390:12=32,5\)
d) \(54:24=2,25\)

18 : 9 = 2

27 : 9 = 3

36 : 9 = 4

45 : 9 = 5

18 : 2 = 9

27 : 3 = 9

36 : 4 = 9

45 : 5 = 9

18*24+18*128-36-36*5-20*9

=18*24+18*128-18*2-18*2*5-2*10*9

=18*24+18*128-18*2-18*10-18*10

=18*(24+128-2-10-10)

=18*130

=2340

ns là lm v~

\(\left(-75\right)\left(18-65\right)-65\left(75-18\right)\)

\(=\left(-75\right).18-\left(-75\right).65-65.75+65.18\)

\(=\left(-75\right).18+75.65-65.75+65.18\)

\(=18.\left[\left(-75\right)+65\right]+\left(75.65-65.75\right)\)

\(=18.\left(-10\right)=-180\)

P/s: Hoq chắc

\(-\left(-2010\right)+36.41-36.\left(-59\right)+\left(-2010\right)\)

\(=2010+\left(-2010\right)+36.\left[41-\left(-59\right)\right]\)

\(=36.100=3600\)