1. 12.18+14.3-255:17=216+42-15

                                  =258-15

                                  =243

yygjgjyvy

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

\(272:16-5+4\left(30-6-255:17\right)\)

\(=17-5+4.9\)

\(=12+36\)

\(=48\)

\(25.8-12.5+272:17-8\)

\(=200-60+16-8\)

\(=140+16-8\)

\(=148\)

          = 17 - 5 + 4.9

          = 12 + 36

          = 48

      2. 25 . 8 - 12.5 + 272 : 17 - 8

        = 200 - 60 + 16 - 8

        = 140 + 16 - 8

        = 148

dễ mà bạn

272:16-5+4(30-6-255:17)

= 272:16-5+4(30-6-15)

= 272:16-5+4(24-15)

= 272:16-5+4.9

= 17-5+36

= 12+36=48

25.8-12.5+272:17-8

= 200-60+16-8

= 140+16-8

= 156-8

= 148

tính nhanh hay tính bình thường???

tính bình thường nhoa:

52

148

17 

k nhoa

=160

=148

=17

cho mik nha

 / 16 = 5/4

AI GIUP TUI VOI

12x18+14x3-255:17

=216+42-15

=258-15

=243

68+42x5-625:25

=68+210-25

=278-25

=253

13+21x5-(198/11-8)

=13+105-(18-8)

=13+105-10

=118-10

=108

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

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

=17-5+4x(25-15)

=17-5+4x10

=17-5+40

=12+40

=52

25x8-12x5+272:17-8

=200-60+16-8

=140+16-8

=156-8

=148

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) \(255+312+188+645\)

\(=\left(255+645\right)+\left(312+188\right)\)

\(=900+500\)

\(=1400\)

b) \(25+12\cdot5-60\)

\(=25+60-60\)

\(=25\)

c) \(12\cdot75+12\cdot7+12\cdot18\)

\(=12\cdot\left(75+7+18\right)\)

\(=12\cdot100\)

\(=1200\)

d) \(2^4\cdot5-\left[131-\left(13-4\right)^2\right]\)

\(=16\cdot5-\left(131-9^2\right)\)

\(=80-\left(131-81\right)\)

\(=80-50\)

\(=30\)

\(a\)\(=6+182+3.3\)

\(=188+9=197\)

\(b;15-200:50\)

\(=15-4=11\)

\(c;200-60+\frac{170}{7}-8\)

\(=140+\frac{114}{7}\)

\(=\frac{1094}{7}\)

a)18 : 3 + 182 + 3.(51:17)

= 6 + 182 + 3.3

= 188 + 9

= 197

b) 15 - 25.8:(100:2)

= 15 - 200 : 50

= 15 - 4 

= 11

c) 25.8 - 12.5 + 170:17 - 8

= 200 - 60 + 10 - 8

= 142

ban nao biet