Tính nhanh: a.-25+36-74-49-51+125-136-26
b.53-98+216-475-153-298-125+84
c.78+99-122+489+122-199-489-178
d.(15-49+47)-(-49-53+115)
e.-(-354+149-47)+(49+153-454)
Tính nhanh
a (-4) x (-3) x 25 x (-8)
b 7x(-25).(-3)2.(-4)
c [93-(20-7)] : 16
d 53-(-51)+(-53)+49
e 168 - (49)+(-68)+4
f 53 -(-7)+(-53)-49
g 25.(-124)+124.25
h (-11).36+64.(-11)
i 125.(-24) +24.125
k 125.(-23)+23.225
l (-11).36+64.(-11)
Giúp mk với!
Dang 2: Sử dụng các tính chất của phép nhân, quy tắc dấu ngoặc để tính nhanh
a) (-4).(-3).25.(-8) b) 7.(– 25).(– 3)2.(– 4)
d) [ 93–( 20–7 )]:16 e) 53 – (–51) + (-53) + 49 f) 168 – (49) + (-68) + 4
g) 53 – (–7) + (-53) – 49 h) 25.(- 124) + 124. 25 i) (-11).36 - 64.11 k) 125.(- 24) + 24.125 l) 125.(-23) + 23.225 m) (-11).36 + 64.(- 11)
mong mọi người giúp mk nha
CÁM ƠN MỌI NGƯỜI NHÌU
Tính nhanh
13.58.4 + 32.26.2+52.10
15.34.4+120.21+21.5.12
14.35.5+10.25.7+20.70
24.( 15+49)+12.(50+42)
53.(51+4)+53.(49+96)+53
42.(15+96)+6.(25+4).7
45.(13+78)+8.(53+25).2
cọu lên gg í <<:
a/(-4) x(-3)x(-125)x25x(-8)
b/ (-4)x9x(-125)x25x(-8)
c/ 7x(-25)x(-3)x2x(-4)
d/ [93-(20-7)] : 16
e/ 53-(-51)+(-53)+49
f/ 168-49+(-68)+4
a) \(\left(-4\right)\left(-3\right)\left(-125\right).25.\left(-8\right)=\left[25\left(-4\right)\right]\left[\left(-125\right)\left(-8\right)\right]\left(-3\right)\)
\(=\left(-100\right).1000.\left(-3\right)=300.1000=300000\)
b) \(\left(-4\right).9\left(-125\right).25.\left(-8\right)=\left[25\left(-4\right)\right]\left[\left(-125\right)\left(-8\right)\right].9\)
\(=\left(-100\right).1000.9=\left(-100\right).9000=-900000\)
c) \(7.\left(-25\right)\left(-3\right).2.\left(-4\right)=\left[\left(-25\right)\left(-4\right)\left(-3\right)\right].7.2=-4200\)
d) \(\left[93-\left(20-7\right)\right]\div16=\left(93-13\right)\div16=80\div16=5\)
e) \(53-\left(-51\right)+\left(-53\right)+49=\left(53-53\right)+\left(51+49\right)=100\)
f) \(168-49+\left(-68\right)+4=168-49-68+4=55\)
1 * 2 * 3 * 4 * 5 * 6 * 7 * 8 * 9 * 10 * 11 * 12 * 13 * 14 * 15 * 16 * 17 * 18 * 19 * 20 * 21 * 22 * 23 * 24 * 25 * 26 * 27 * 28 * 29 * 30 * 31 * 32 * 33 * 34 * 35 * 36 * 37 * 38 * 39 * 40 * 41 * 42 * 43 * 44 * 45 * 46 * 47 * 48 * 49 * 50 * 51 * 52 * 53 * 54 * 55 * 56 * 57 * 58 * 59 * 60 * 61 * 62 * 63 * 64 * 65 * 66 * 67 * 68 * 69 * 70 * 71 * 72 * 73 * 74 * 75 * 76 * 77 * 78 * 79 * 80 * 81 * 82 * 83 * 84 * 85 * 86 * 87 * 88 * 89 * 90 * 91 * 92 * 93 * 94 * 95 * 96 * 97 * 98 * 99 * 100 bằng bao nhiêu?
tinh nhanh
a, 39*49-39*17 b,12*53+53*172-53*84
c,17+18+19+99 d, 23+25+49
e,46-45+44-43
a, 39*49-39*17
= 39 (49 - 17)
= 39 * 32
= 1248
b,12*53+53*172-53*84
= 53 (12 + 172 -84)
= 53 * 100
= 5300
c,17+18+19+99
= 17 + 17 +1 + 17 +2 + 99
= 3 * 17 + (1+ 99) + 2
= 151 +2
= 153
d, 23+25+49
= 48 + 49
= 97
e,46-45+44-43
= (46 + 44) + (-45 -43)
= 88 + (-88)
= 0
Tính nhanh.
a) (-4).(-8).(-17).(-25).125
b) (236 – 362) – (638 + 463)
c) (- 325 – 147) – ( - 625 + 853) – (-96)
d) 69.(- 47) – 31. (- 47)
e) 98. (- 37) + (- 49).126
f) – 35. (49 – 125) – 125 .(35 – 49)
g) 2 + 4 – 6 – 8 + 10 + 12 – 14 – 16 + …+ 90 + 92 – 94 – 96
h) 1 + 3 + 3 2 + 3 3 + ….+ 3 50
Bài 1:Tính hợp lí:
-5 + (-37 - 45 + 51) - (-37 + 51)
-(15 - 47 + 58) + (15 - 47) +3
(53 - 45 - 49) -( 53 +45 - 49)
13-15+49-13+15-48
Giúp mình vs ạ,mình đang cần gấp!!!
-5 + (-37 - 45 + 51) - (-37 + 51)
= -5 - 37 - 45 + 51 + 37 - 51
= - (5 + 45) - (37 - 37) + (51 - 51)
= - 50 - 0 + 0
= - 50
- (15 - 47 + 58) + (15 - 47 ) + 3
= - 15 + 47 - 58 + 15 - 47 + 3
= (-15 + 15) + (47 - 47) - (58 - 3)
= 0 + 0 - 55
= - 55
(53 - 45 - 49) - (53 + 45 - 49)
= 53 - 45 - 49 - 53 - 45 + 49
= (53 - 53) + (-49 + 49) - (45 + 45)
= 0 + 0 - 90
= - 90
13 - 15 + 49 - 13 + 15 - 48
= (13 - 13) + (-15 + 15) + (49 - 48)
= 0 + 0 + 1
= 1
5) (34-53+28)-(34-53-21). (15-57+38)-(15+21+38)
(23-15+38)-(-47-15+23). (53-37+19)-(19+53-25)
(125+49-37)-(49+125-228). (221+23-58)-(58+221+23)
Úp nha
(34 - 53 + 28) - (34 - 53 - 21)
= 34 - 53 + 28 - 34 + 53 + 21
= (34 - 34) - (53 - 53) + (28 + 21)
= 0 - 0 + 49
= 49
(23 - 15 + 38) - (-47 - 15 + 23)
= 23 - 15 + 38 + 47 + 15 - 23
= (23 - 23) - (15 - 15) + (38 + 47)
= 85
(125 + 49 - 37) - (49 + 125 - 228)
= 125 + 49 - 37 - 49 - 125 + 228
= (125 - 125) + (49 - 49) - (37 - 228)
= -(-191) = 191