tính nhanh 1452+96+(-23)+72-73-96
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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)
72,9 x 99 + 72 + 0,9
= 72,9 x 99 + 72,9
= 72,9 x (99 + 1)
= 72,9 x 100 = 7290
b)
0,8 x 96 + 1,6 x 2
= 0,8 x 96 + 0,8 x 2 x 2
= 0,8 x 96 + 0,8 x 4
= 0,8 x (96 +4)
= 0,8 x 100 = 80
Chúc em học tốt!!!
a) 96,28 x 3,527 + 3,527 x 3,72
= 3,527 x ( 96,28 + 3,72 )
= 3,527 x 100
= 352,7
a) 96,28 x 3,527 + 3,527 x 3,72
= 3,527 x ( 96,28 + 3,72 )
= 3,527 x 100
= 352,7
b) 72,9 x 99 + 72 + 0,9
= 72,9 x 99 + 72,9
= 72,9 x ( 99 + 1 )
= 72,9 x 100
= 7290
c) 0,8 x 96 + 1,6 x 2
= 0,8 x 96 + 0,8 x 2 x 2
= 0,8 x ( 96 + 2 + 2 )
= 0,8 x 100
= 80
84,64 - ( 30,6 + 14,04)
= 84,64 - 44,64
= 40
84,64 - ( 30,6 + 14,04)
= 84,64 - 30,6 - 14,04
= 54,04 - 14,04
= 40
196,27: 0,01 + 96 + 73: 0,01
= 19627 + 96 + 7300
= 19723 + 7300
= 27023
196,27 : 0,01 + 96 + 73: 0,01
=( 196,27 + 73): 0,01 + 96
= 269,27 : 0,01 + 96
= 26927 + 96
= 27023
1452+96+(-23)+72-73-96
=1452+[+96+(-96)]+[(-23)+72-73]
=1452+0+[(-23)+(-1)]
=1452+-24
=1428
k nhe