\(a,6,7\%+5,96\%=0,067+0,0596=0,1266\)
\(b,96,8\%-54,9\%+4,5\%=0,986-0,549+0,045=0,482\)
\(c,9\times8,7\%=9\times0,087=0,783\)
\(d,96,5\%:5=0,965:5=0,193\)
A. 12.66 %
B. 46.4 %
C. 78.3 %
D . 19.3 %
Bài 1 : Tính nhanh
a, 0,36 .350 + 1,2 .20 . 3 + 9 . 4 . 4,5
b, B = 2015.2016-5/2015.2015+2010
c, C = 2/1.3 + 2/3.5 + 2/5.7 + .......+ 2/69.71+ 2/71.73
d, D= (1+1/2) . ( 1+1/3) . (1+1/4) ...... (1+1/2017) . (1+1/2018)
e, E=1/4.5 + 1/5.6 + 1/6.7+........+1/79.80+1/80.81
f, F=3/2.3 + 3/3.4 + 3/4.5 + .......+ 3/99.100
g, G= 5/1.4 + 5/4.7 + 5/7.10 + .......+5/61.64
nhanh nha , mk cần gấp
b1 : tìm x
a) 5/3 . x + 1/6 .x - x = 25/36
b) ( 2/4.5 + 2/5.6 + 2/6.7 + 2/7.8) - 1/x = 1/3
c) 2009 - ( 4.2/9 + x - 26/18 ) : 3/2= 2008
A= 12+2.3+3.4.4.5+5.6+6.7+7.8+8.9
B= 12+2.3+3.4+4.5+..................+53.54
C= 12.13+13.14 +14.15 +15.16+.............+207.208
a 13/15:26/45
b 4.5:1.2
c 8/9:2
d 3 gio 45 phut x 5
e 11.7:4.5
g 29phut 12giay:14
Tính B= \(\dfrac{1}{3.4}\)-\(\dfrac{1}{4.5}\)-\(\dfrac{1}{5.6}\)-\(\dfrac{1}{6.7}\)-\(\dfrac{1}{7.8}\)-\(\dfrac{1}{8.9}\)-\(\dfrac{1}{9.10}\)
D= (1+1/2) . ( 1+1/3) . (1+1/4) ...... (1+1/2017) . (1+1/2018)
E=1/4.5 + 1/5.6 + 1/6.7+........+1/79.80+1/80.81
tính nhanh :
a) 1/2.3 + 1/3.4 + 1/4.5 + 1/5.6 + 1/6.7 + ... + 1/98.99 + 1/99.100
b) 201.204+1/204.203-407
CÁM ƠN !
Tính nhanh :
1/2.3 + 1/3.4 + 1/4.5 + 1/5.6 + 1/6.7 + .... + 1/200.201
Tinh A : 1.2 + 3.4 + 4.5 + 5.6 + 6.7 +..... +58.59 +59.60
