1. thực hiện phép tính
a/ 47 . 32 . 96 : 613
b/ ( 216 + 28 ) : ( 213 + 25 )
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NT
1
H9
HT.Phong (9A5)
CTVHS
22 tháng 11 2023
a) \(31\cdot72+\left(-31\right)\cdot70-2\cdot70\)
\(=31\cdot72-31\cdot70-2\cdot70\)
\(=31\cdot\left(72-70\right)-2\cdot70\)
\(=31\cdot2-2\cdot70\)
\(=2\cdot\left(31-70\right)\)
\(=2\cdot-39\)
\(=-78\)
b) \(25\cdot\left(32+17\right)-32\cdot\left(25+47\right)\)
\(=25\cdot32+25\cdot17-32\cdot25-32\cdot47\)
\(=25\cdot\left(32-32+17\right)-32\cdot47\)
\(=25\cdot17-32\cdot47\)
\(=425-1504\)
\(=-1079\)
24 tháng 7 2017
A, 32 * 47 + 32 * 53
= 32 * ( 47 + 53 )
= 32 * 100
= 3200 .
B, 875 + 5375 : 25 - 875
= 875 - 875 + 5375 : 25
= 0 + 2115
= 215 .
C, 5 * 25 * 2 * 16 * 4
= ( 5 * 2 * 16 ) * ( 25 * 4 )
= 160 * 100
= 16000 .
25 tháng 2 2020
( -7 ) . ( - 70 + 58 ) - ( - 13 ) . ( - 19 + 39 ) ( -79 ) - ( -81 ) - 72 -(-8) . (-5)
(-75 ) . ( -3 ) - (-41 + 51 ) . (-6) ( -6 + 13 ) . ( -2 )2 + ( -16 ) . (-58 + 68 )
4 tháng 6 2021
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) \(3^3.18+72.4^2-41.18\)
\(=18.\left(27-41\right)+72.16\)
\(=18.-14+1152\)
\(=-252+1152\)
\(=900\)
4 tháng 6 2021
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!
CM
17 tháng 8 2019
a) − 5 7 + 7 13 + − 9 17 + 2 − 7 + 6 13 = − 5 7 + − 2 7 + 7 13 + 6 13 + − 9 17 = − 1 + 1 + − 9 17 = − 9 17
b) 29 4 11 − 3 7 13 + 25 4 11 = 29 4 11 − 25 4 11 − 3 7 13 = 4 − 3 7 13 = 3 13 13 − 3 7 13 = 6 13
NL
4
DP
24 tháng 4 2017
a, 39 x 213 + 87 x 39
= 39 x ( 213 + 87)
= 39 x 300
= 11700
b. 27 x 75 + 25 x 27 - 150
= 27 x ( 75 + 25 ) - 150
= 27 x 100 - 150
= 2700 - 150
= 2550
LH
24 tháng 4 2017
a) 39 x 213 + 87 x 39
= 39 x ( 213 + 87 )
= 39 x 300
= 11700
b) 27 x 75 + 25 x 27 - 150
= 27 x ( 75 + 25 ) - 150
= 27 x 100 - 150
= 2700 - 150
= 2550
a) \(4^7.3^2.9^6:6^{13}=2^{14}.3^2.3^{12}:6^{13}=2^{14}.3^{14}:6^{13}=\left(2.3\right)^{14}:6^{13}=6^{14}:6^{13}=6\)
b) \(\left(2^{16}+2^8\right):\left(2^{13}+2^5\right)=2^8\left(2^8+1\right):2^5\left(2^8+1\right)=2^8:2^5=2^{8-5}=2^3=8\)