Thuc hien phep tinh ) B = 1 - 3 + 5 - 7 + 9 - 11 + ... + 2017 -2019
Những câu hỏi liên quan
Thuc hien cac phep tinh sau ;a] [5/6 + 6/9 ] * 3/11
b] [ 7/6 - 1/4 ] \ 3/4
Thuc hien phep tinh bang cach tinh nhanh :
a) 4/9 + 3/2 + 6/36.
b) 2/7 x 5/17 + 12/7 x 15/17.
c) 2,34 + 5,18 + 7,66.
d) 7/11 : 3/4 + 7/11 : 1/4.
GIUP MINH MINH DANG CAN GAP.
thuc hien cac phep tinh sau ;
2va3/4 . (-0,4)+ 1va3/5 . 1,75 + (-7,2) : 9 / 11
1/8 . 15va2/5 + 1va4/5 . 7/8 - 17va 1/5 . 1/8
-5/7 . 2/11 + (-5) / 7 . 9/11 + 1va5/7
6/5 + 5/8 : 5 - 3/16 . (-2)3
Thuc hien phep tinh:
a.3/7.11/15+3/7:15/14+2/7
b.(-7/15).5/8.15/-7(-32)
c.[(1/9:8/27):-1/3]:81/128
d.-66(1/2-1/3+1/11)+124(-37)+63(-124)
thuc hien phep tinh a=(155-10/7-5/11+5/23)/(403-26/7/13/11+13/23)+(3/5+3/13-0.9)/(7/91+0.2-3/10)
bai 1: Thuc hien phep tinh
a) 75/100 + 18/21 + 19/32 + 1/4 + 3/21 + 13/32
b) 22/5 + 51/9 + 11/4 + 3/5 + 1/3 + 1/4
1a
75/100+18/21+19/32+1/4+3/21+13/32
= 3/4 +6/7+19/32+1/4+1/7+13/32
= (3/4+1/4)+(19/32+13/32)+(6/7+1/7)
= 1+1+1=3
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1b
22/5+51/9+11/4+3/5+1/3+1/4
=22/5+17/3+11/4+3/5+1/3+1/4
=(22/5+3/5)+(17/3+1/3)+(11/4+1/4)
=25/5+18/3+12/4
=5+6+3
=14
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thuc hien phep tinh
m=1+(-2)+3+(-4)+...+(-2016)+2017
m = 1 + ( -2 ) + 3 + ( -4 ) + ....... + ( - 2016 ) + 2017
m = [ 1 + ( - 2 ) ] + [ 3 + ( -4 ) ] + ...... + [ 2015 + ( -2016 ) + 2017
m = ( -1 ) + ( -1 ) + ...... + ( -1 ) + 2017
có 1008 số -1
m = ( -1 ) x 1008 + 2017
m = ( -1008 ) + 2017
, = 1009
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Ta có :
m = 1 + ( -2 ) + 3 + ( -4 ) + ....... + ( - 2016 ) + 2017
m = [ 1 + ( - 2 ) ] + [ 3 + ( -4 ) ] + ...... + [ 2015 + ( -2016 ) + 2017
m = ( -1 ) + ( -1 ) + ...... + ( -1 ) + 2017 [ có 1008 số -1 ]
m = ( -1 ) x 1008 + 2017
m = ( -1008 ) + 2017
m = 1009
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thuc hien phep tinh :
a) 28/11 . 21/22 . 9
a) \(\dfrac{28}{11}\cdot\dfrac{21}{22}\cdot9\)
\(=\dfrac{28\cdot21}{11\cdot22}\cdot9\)
\(=\dfrac{14\cdot21}{11\cdot11}\cdot9\)
\(=\dfrac{294}{121}\cdot9\)
\(=\dfrac{2646}{121}\)
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khong thuc hien phep nhan hay nhan xet xem moi tich sau tan cung boi chu so nao ?
a, 1 2 3 4 5 6 7 8 9
b, 1 3 5 7 9 11