Tính nhanh: (2 + 4 + 6 + ... + 100) (36.333 - 108.111) ta được kết quả là
A. 0
B. 1002
C. 20
D. 2
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a) (2+4+6+.....+100) . (36.333-108.111)
= (2+4+6+...+100).(36.111.3-108.111)
= (2+4+6+...+100).(108.111-108.111)
= (2+4+6+...+100).0
=0
b) 19991999.1998-19981998.1999
= 1999.10001.1998-1998.10001.1999
= 0
a) ( 2 + 4 + 6 + ... + 100 ) . ( 36.333 - 108.111 )
= ( 2 + 4 + 6 + ... + 100 ) . ( 36.3.111 - 108.111)
= ( 2 + 4 + 6 + ... + 100 ) . ( 108.111 - 108.111 )
= ( 2 + 4 + 6 +... + 100 ) . 0
= 0
b) 19991999.1998 - 19981998 . 1999
= 1999.10001.1998 - 1998.10001 . 1999
= 0
b. (2+4+6+...+100).(36.333.108.111)
=(2+4+6+...+100). 0
= 0
a/ \(19.64+76.34\)
\(=19.4.16+19.4.34\)
\(=19.4\left(16+34\right)\)
\(19.4.50\)
\(=19.200=3800\)
b, \(136.68+16.272\)
\(=136.68+32.136\)
\(=136\left(68+32\right)\)
\(=136.100=13600\)
c/ \(\left(2+4+6+..........+100\right)\left(36.3.333-108.111\right)\)
\(=\left(2+4+....+100\right)\left(36.3.111-108.100\right)\)
\(=\left(2+4+.......+100\right)\left(108.111-108.111\right)\)
\(\left(2+4+...+100\right).0=0\)
(2+4+6+...+100).(36.333-108.111
=(2+4+6+...+1000).(36.3.111-108.111)
=(2+4+6+...+1000.(108.111-108.111)
=(2+4+6+...+100).0
0
(2+4+6+8+...+100). (36.333-108.111)
= (2+4+6+...+100).(36.3.111-108.111)
=(2+4+6+...+100).(108.111-108.111)
=(2+4+6+...+100).0
=0
A= 19 . 64+ 76.34
A=19.2.32+38.2.34
A=38.32+38.68
A=38.(32+68)
A=38.100
A=3800
B= 35 .12+ 65.13
B= 35.12+65.(12+1)
B=35.12 +65.12+65
B=(35+65).12 +65
B=100.12+65
B=1200+65
B=1265
C=136.68+16.272
C=136.68+16.2.136
C=136.68+32.136
C=136.(68+32)
C=136.100
C=13600
D=(2+4+6+...+100).(36.333-108.111)
D=(2+4+6+...+100).(36.333-36.3.111)
D=(2+4+6+...+100).(36.333+36.333)
D=(2+4+6+..+100).0
D=0
E=19991999.1998+19981998.1999
E=1999.10001.1998-1998.10001.1999
E=0
A= 19.64 +76.34 B=35.12 +65.13
=76(16+34) =35.13-35+65.13
=76.50 =1300-35
=380 =1765
c)136.68+16.272
=136.68+16.2.136
=136.68+32.136
=136.(68+32)
=136.100=13600
a)19.64+76.34
=19.64+19.4.34
=19.64+19.136
=19.(64+136)
=19.200=3800
b)=(35+65)6.2.13
=100.(2.13).6
=100.(26.6)
=100.153
=15300
Đáp án cần chọn là: A
(2+4+6+...+100)(36.333−108.111)
=(2+4+6+...+100)(36.3.111−36.3.111)
=(2+4+6+...+100).0=0