Tính giá trị các biểu thức sau:
a, 12.18 + 14.3 – 255:17
b, 13 + 42.5 – (198:11 – 8)
c, 25.8 – 12.5 + 272:17 – 8
d, 2 3 - 5 3 : 5 2 + 12 . 2 2
2: Thực hiện phép tính (B1 trang 8 BD năng lực tự học)
1. 12.18+14.3-225:17
2. 68+42.5-625:25
3. 13+21.5-(198:11-8)
4. 272:16-5+4.(30-5-255:17)
5. 25.8-12.5+272:17-8
6. 125:25+14-142:71
7. 13.17-256:16+14:7-1
8. 15.24-14.5.(145:5-27)
9. 289:17-324:18+18:3 10.18.3-182+3.(51:17)
11.(64+115+36)-25.8
12.15.8-(17-30+83)-144:6
13.19+19.99-25.8 14.250:50-(46-75+54):5
15.13.(17-95+83):5-18:9
16.140-180.(47-90+43)+7
17.24.(15+30+85-120):10
18.27+73-30: (25-10)
19.18-4.(27-90+73):10
20.15-25.8:(100.2)
1. 12.18+14.3-255:17=216+42-15
=258-15
=243
Bài 1 : Tính
13 + 21.5 - (198 : 11 - 8)
272 : 16 - 5 +4 (30 - 5 - 255 : 17)
15.24 - 14.5 (145 : 5 - 27)
18.3 - 18.2 + 3 (51 : 17)
(64 + 115 + 36) - 25.8
15.8 - (17 - 30 + 83) - 144 : 6
250 : 50 - (46 - 75 + 54) : 5
13 (17 - 95 + 83) : 5 - 18 : 9
140 - 180(47 - 90 + 43) + 7
24 (15 + 30 + 85 - 120):10
27 + 73 - 30 : (25 -10)
18 - 4 (27 - 90 + 73) : 10
Bài 2: Tính
140 - [ 25 : (4 mũ 2 - 11) + 4 ]
ALOO CÁC THIÊN TÀI ƠI GIÚP MÌNH VỚI Ạ,MÌNH ĐANG CẦN GẤP !!!
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(30-6-255:17)
25.8 - 12.5+272:17-8
Ai biết giúp mk nha ^^
\(272:16-5+4\left(30-6-255:17\right)\)
\(=17-5+4.9\)
\(=12+36\)
\(=48\)
\(25.8-12.5+272:17-8\)
\(=200-60+16-8\)
\(=140+16-8\)
\(=148\)
= 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
272:16-5+4.(30-5-255:17)=
25.8-12.5+272;17-8=
125:25+14-142:71=
tính nhanh hay tính bình thường???
tính bình thường nhoa:
52
148
17
k nhoa
/ 16 = 5/4
AI GIUP TUI VOI
12x18+14x3-255:17
68+42x5-625:25
13+21x5-(198/11-8)
272:16-5+4x(30-5-255:17)
25x8-12x5+272:17-8
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
1.Tính:
a) 13 + 21 . 5 - (198 : 11 -8)
b) 272 : 16 - 5 + 4 . (30 - 5 - 255 : 17)
c) 15 . 24 - 14 . 5 . (145 : 5 - 27)
d) 18 . 3 - 18 . 2 + 3 . (51 : 17)
e) (64 + 115 + 36) - 25 . 8 . 6 . 22 . 3 + 42
f) 15 . 8 - (17 - 30 + 83) - 144 : 6
g) 250 : 50 - (46 - 75 + 54) : 5
h) 13 . (17 - 95 + 83) - 144 : 6
i) 140 - 180 . (47 - 90 + 43) + 7
j) 24 . (15 + 30 + 85 - 120) : 10
2.Tính
a) 22 . 3 - 4 b) 16 - 23 . 2 c) 42 - 4 . 2
d) 33 - 2 . 32 e) 72 - 9 . 22 f) 22 . 3 + 42
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
Tính, tính hợp lí nếu có thể:
a. 255 + 312 + 188 + 645
b. 25 + 12.5 - 60
c. 12.75 + 12.7 + 12.18
d. 24.5 - [131 - (13 - 4)2 ]
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) \(2^4\cdot5-\left[131-\left(13-4\right)^2\right]\)
\(=16\cdot5-\left(131-9^2\right)\)
\(=80-\left(131-81\right)\)
\(=80-50\)
\(=30\)
thực hiệ phép tính
18:3+182+3.(51:17)
15-25.8: ( 100 : 2)
25.8 -12.5+170:17-8
\(a\)\(=6+182+3.3\)
\(=188+9=197\)
\(b;15-200:50\)
\(=15-4=11\)
\(c;200-60+\frac{170}{7}-8\)
\(=140+\frac{114}{7}\)
\(=\frac{1094}{7}\)
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
1.Tính giá trị các biểu thức sau:
a)7/-24 +3/2 -9/8 +11/-4
b)6/13 + -17/39 -7/3
c)-17/13 - 4/-13 + 100/47
d)-7/2 + 6/5 - 1/2 -3/5
e12/-11 + 3/7 + 8/14 + (-1)