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Ta có : 28 . 76 + 24 . 28 - 28 . 20 = 28 . ( 76 + 24 - 20 )
= 28 . 80
= 2240
1.s= (27+33) + (28+32) + (29+31) + (26+30)
s= 60 + 60 + 60 + 56
s= 60 . 3 + 56
s= 180 + 56
s= 236
A)
-65.(87-17)-87.(17-65)
=-65.87-(-65).17-87.17-87.(-65)
=-(-65).17-87.17
=65.17-87.17
=17.(65-87)
=17.(-22)
=-374
B)
72.(28-49)+28.(-49-72)
= 72.28-72.49+28.(-49)-28.72
= -72.49+28.(-49)
= 72.(-49)+28.(-49)
= (-49).(72+28)
= -49.100
=-4900
C)
18-(-27)+63-(63+27)
= 18+27+63-63-27
= 45+0-27
= 45+(-27)
=45-27
=18
KICK MÌNH NHÁ
a, 160-(8.25-6.25)
= 160-[25.(8-6)]
=160-(25.2)
=160-50
=110
b, 28.(76+24)
=28.100
=2800
a. 160 - ( 23 . 52 - 6 .25 )
= 160 - ( 8 . 25 - 6 .25 )
= 160 - [ 25 . ( 8 - 6 ) ]
= 160 - [ 25 . 2 ]
= 160 - 50 = 110
b. 28 . 76 + 24 . 28
= 28 . ( 76 + 24 )
= 28 . 100 = 2800
c. 4 . 52 - 32 . 24
= 4 . 25 - 32 . 16
= 4 . 25 - 32 . 4 . 4
= 4 . ( 25 - 32 . 4 )
= 4 . ( 25 - 128 )
= 4 . ( - 103 ) = - 412
d. 587 : [ 928 - ( 247 - 82 ) . 5 ]
= 587 : [ 928 - 165 . 5 ]
= 587 : [ 928 - 825 ]
= 587 : 103 = 5.69902913
a ) 5 . ( - 2 ) . ( - 3 )
= ( - 10 ) . ( - 3 )
= 30
b ) ( - 20 ) + ( - 12 ) - ( - 4 )
= ( - 20 ) + ( - 12 ) + 4
= ( -20 ) + [ ( - 12 ) + 4 ]
= ( - 20 ) + ( - 8 )
= - 28
c . 78 . 45 - 145 . 78
= 78 . ( 45 - 145 )
= 78 . ( - 100 )
= - 7800
a,- 129 - 72 -( - 29 ) + ( - 28 ) + 2017
= - 200 +2017
= 1817
b, ( - 35 ) . 37 - 37 . 5 + ( - 37 ) . 60
= - 1295 - 185 + ( - 2220 )
= - 3700
A= -1 + -1 + -1 +....+ -1
so chu so -1 la { (76-1):1+1}:2=38
A=-38
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!
76+28+124+72=124+76+28+72
(124+76)+(72+28)=200+100=300
34.27+34.73=34.(27+73)=34.100=3400