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Bài 1
2997 + 113 = 3110 199 + 56 = 255 121 - 98 = 23 286 - 99 = 187
213 - 997 = -784 16 x 50 = 800 28 x 25 = 700 24 x 125 =3000
1300 : 50 = 26 600 : 25 = 24 3000 : 125=24
a) 125 . 101 = 125 . (100 + 1) = 125 . 100 + 125 . 1
= 12 500 + 125 = 12 625
b) 21 . 49 = 21 . (50 - 1) = 21 . 50 - 21 . 1
= 1 050 - 21 = 1 029
D = 2 . 3 + 4 . 5 + 6. 7 + ... + 50 . 51 = 150,850
E = 1 . 99 + 2 . 98 + 3 . 97 + ... + 49 . 51 + 50 .50 = 82,464
Tick nha
a,1300:50=26
b,600:25=24
c,3000:125=24
d,16x50=800
chúc bạn học tốt!
a) 125 x 25 x 64
= ( 25 x 64 ) x 125
= 1600 x 125
= 200 000
b) 125 x 25 x 12 x 14
= ( 125 x 12 ) x ( 25 x 14 )
= 1500 x 350
= 525000
c) 1300 : 50 = 26
d) 700 : 25 = 28
a, = 125 x (25x64)=125 x 1600= 200 000
b, = (125 x 24) x ( 25 x 12) = 3000 x 300 = 900 000
c, 1300 : 50 = 26
d, 700 : 25 = 28.
16.19
=16.(20-1)
=320-16
=304
46.99
=46.(100-1)
=4600-46
=4554
35.98
=35.(100-2)
=3500-70
=3430
16.(20-1)=320-16=304
46.(100-1)=4600-46=4554
35.(100-2)=3500-70=3430
a) \(227+50+23=\left(227+23\right)+50=250+50=300\)
b) \(135+360+65+40=\left(135+65\right)+\left(360+40\right)=200+400=600\)
c) \(1+2+3+4+5+...+97+98+99+100\)
\(=\left(100+1\right)+\left(99+2\right)+...+\left(50+51\right)\)
\(=101+101+101+...+101\)
\(=101\cdot50\)
\(\Leftrightarrow5050\)
d) \(115\cdot13-13\cdot15=13\cdot\left(115-15\right)=13\cdot100=1300\)
e) \(50-49+48-47+...+4-3+2-1\)
\(=\left(50-49\right)+\left(48-47\right)+...+\left(2-1\right)\)
\(=1+1+1+1+..+1\)
\(=1\cdot25\)
\(=25\)
f) \(30\cdot40\cdot50\cdot60=10\cdot3+10\cdot4+10\cdot5+10\cdot6\)
\(=10\cdot10\cdot10\cdot10\cdot3\cdot4\cdot5\cdot6\)
\(=10000\cdot360\)
\(=3600000\)
g) \(27\cdot36+27\cdot64=27\cdot\left(36+64\right)=27\cdot100=2700\)
h) \(5\cdot2^2-18:3=5\cdot4-18:3=20-6=14\)
i) \(13\cdot17-256:16+14:7-2021^0\)
\(=13\cdot17-4^4:4^2+2-1\)
\(=13\cdot17-16+2-1\)
\(=13\cdot17-17\)
\(=17\cdot\left(13-1\right)\)
\(=204\)
j) \(7^2-36:3=49-12=37\)
a) 98+47 = 145
b)121-98=23
c)16.50=800
d)1300:50=26
a) 98 + 47 = (98 + 2) + (47 - 2) = 100 + 45
= 145
b) 121 - 98 = (121 + 2) - (98 + 2) = 123 - 100
= 23
c) 16 . 50 = (16 : 2) . (50 . 2) = 8 . 100
= 800
d) 1300 : 50 = (1300 . 2) : (50 . 2) = 2600 : 100
= 26