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152 - 148 + 144 - 140 + 136 - 132 + 128 - 124 + 120 - 116 + 112 - 108 + 104 - 100=
= ( 152 -132 ) - ( 148 - 128 ) + ( 144 - 124 ) - ( 140 - 120 ) + ( 136 - 116 ) - ( 132 - 112 ) - ( 124 - 104 )
= 20 - 20 + 20 - 20 + 20 - 20 - 20
= -20
HOk tốt!!!!!!!!
Tính nhanh các tổng sau:
a) 2 + 5 + 8 + 11 + 14 + 17 + 20 + 23 + 26 + 29
= ( 2+ 8 ) + ( 5 + 20) + ( 11 + 29 ) + ( 14 + 26 ) + ( 17 + 23 )
= 10 + 25 + 40 + 40 + 40
= 35 + 120
= 155
b) 120 + 116 + 112 + 108 + 104 + 100 + 96 + 92 + 88 + 84 + 80
= ( 120 + 80 ) + ( 116 + 84 )+ ( 112 + 88 ) + ( 108 + 92 ) + ( 104 + 96 ) + 100
= 200 + 200 + 200 + 200 + 200 + 100
= 200 x 5 + 100
= 1100
Giải;
1) \(347.222-222.\left(216+184\right):8\)
\(=347.222-222.400:8\)
\(=347.222-222.50\)
\(=222.\left(347-50\right)\)
\(=222.297\)
\(=65934\)
2) \(132-\left[116-\left(132-128\right).22\right]\)
\(=132-\left[116-4.22\right]\)
\(=132-\left[116-88\right]\)
\(=132-28\)
\(=104\)
3) \(16:\left\{400:\left[200-\left(37+46.3\right)\right]\right\}\)
\(=16:\left\{400:\left[200-\left(37+138\right)\right]\right\}\)
\(=16:\left\{400:\left[200-175\right]\right\}\)
\(=16:\left\{400:25\right\}\)
\(=16:16\)
\(=1\)
4) \(\left\{184:\left[96-124:31\right]-2\right\}.3651\)
\(=\left\{184:\left[96-4\right]-2\right\}.3651\)
\(=\left\{184:92-2\right\}.3651\)
\(=\left\{2-2\right\}.3651\)
\(=0.3651\)
\(=0\)
5) \(46-\left[\left(16+71.4\right):15\right]-2\)
\(=46-\left[\left(16+284\right):15\right]-2\)
\(=46-\left[300:15\right]-2\)
\(=46-20-2\)
\(=24\)
6) \(3^3.18+72.4^2-41.18\)
\(=18.\left(27-41\right)+72.16\)
\(=18.-14+1152\)
\(=-252+1152\)
\(=900\)
Giải: (tiếp)
7) \(\left(56.46-25.23\right):23\)
\(=\left(2576-575\right):23\)
\(=2001:23\)
\(=87\)
8) \(\left(28.54+56.36\right):21:2\)
\(=\left(1512+2016\right):21:2\)
\(=3528:21:2\)
\(=84\)
9) \(\left(76.34-19.64\right):\left(38.9\right)\)
\(=\left(2584-1216\right):342\)
\(=1368:342\)
\(=4\)
10) \(\left(2+4+6+...+100\right).\left(36.333-108.111\right)\)
\(=\left(2+4+6+...+100\right).\left(11988-11988\right)\)
\(=\left(2+4+6+...+100\right).0\)
\(=0\)
11) \(\left(5.4^{11}-3.16^5\right):4^{10}\)
\(=5.4^{11}:4^{10}-3.16^5:4^{10}\)
\(=5.4-3.1\)
\(=20-3\)
\(=17\)
12) \(7256.4375-725:3650+4375.7255\)
\(=4375.\left(7256+7255\right)-\dfrac{29}{146}\)
\(=4375.14511-\dfrac{29}{146}\)
\(=63485624,8\)
Câu 12 ko chắc!
☠ 
a) Cách 1: 7 4 : 7 3 = 2401 : 343 = 7
Cách 2: 7 4 : 7 3 = 7 4 - 3 = 7 .
b) Cách 1: 10 8 : 10 4 = 100000000 : 10000 = 10000 .
Cách 2: 10 8 : 10 4 = 10 8 - 4 = 10 4 = 10000 .
c) Cách 1: 100 3 : 100 = 1000000 : 100 = 10000 .
Cách 2: 100 3 : 100 = 100 2 = 10000 .
a, Cách 1: 2 6 : 2 4 = 64 : 16 = 4
Cách 2: 2 6 : 2 4 = 2 6 - 4 = 2 2 = 4
b, Cách 1: 3 5 : 3 3 = 243 : 27 = 9
Cách 2: 3 5 : 3 3 = 3 5 - 3 = 3 2 = 9
c, Cách 1: 6 4 : 6 2 = 1296 : 36 = 36
Cách 2: 6 4 : 6 2 = 6 4 - 2 = 6 2 = 36
d, Cách 1: 7 4 : 7 3 = 2401:343 = 7
Cách 2: 7 4 : 7 3 = 7 4 - 3 = 7
e, Cách 1: 10 8 : 10 4 = 100000000 : 10000 = 10000
Cách 2: 10 8 : 10 4 = 10 8 - 4 = 10 4 = 10000
f, Cách 1: 100 3 : 100 = 1000000 : 100 = 10000
Cách 2: 100 3 : 100 = 100 3 - 1 = 100 2 = 10000
\(=\left(152-148\right)+\left(144-140\right)+\left(136-132\right)+\left(128-124\right)+\left(120-116\right)+\left(112-108\right)+\left(104-100\right)\\ =4+4+4+4+4+4+4=28\)
=(152−148)+(144−140)+(136−132)+(128−124)+(120−116)+(112−108)+(104−100)=4+4+4+4+4+4+4=28