\(\frac{7}{8}+\frac{19}{32}+\frac{2}{16}+\frac{13}{32}\)
\(=\frac{14}{16}+\frac{19}{32}+\frac{2}{16}+\frac{13}{32}\)
\(=\left(\frac{14}{16}+\frac{2}{16}\right)+\left(\frac{19}{32}+\frac{13}{32}\right)\)
\(=1+1=2\)
\(\frac{7}{8}+\frac{19}{32}+\frac{2}{16}+\frac{13}{32}\)
\(=\frac{14}{16}+\frac{19}{32}+\frac{2}{16}+\frac{13}{32}\)
\(=\left(\frac{14}{16}+\frac{2}{16}\right)+\left(\frac{19}{32}+\frac{13}{32}\right)\)
\(=1+1=2\)
1. Tính nhanh
a) A=1/ 5 .6 + 1/ 6 .7 + 1/ 7. 8+ ... + 1/24 . 25
b) B= 2/ 3 .5 + 11/ 8 .19 + 13/ 19 .32 + 25/ 32 . 57 + 30/ 57 . 87
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+30+31+32+32+...+1000000
(/ là phần, * là cộng)
Tính nhanh:
A= 1/2 + 1/6 + 1/12 + 1/20 + 1/30 + 1/42 + 1/56 + 1/72
B= 1/5*6 + 1/6*7 + 1/7*8 +........+ 1/24*25
C= 2/3*5 + 3/5*8 + 11/8*19 + 13/19*32 + 25/32*57 + 30/57*87
Bài 1 Tính nhanh
a) -3/7 + 5/13 + 3/7
b) -5/21+-2/21+8/24
c) -5/11+(-6/11+2)
d) (-1/32+1/2)+15/32
e)5/17+ -6/13 + 3/4 + 7/-13+12/17
f) 7/23+-18/18+-4/9+16/23+-5/8
g)1/3+-3/4+3/5+-1/36+1/15+-2/9
h)-1/2+1/3+-1/4+-2/8+4/18+4/9
tính nhanh:
-13/8.(8/13+32/28)-15/7
bài 1:Tính nhanh
a,64*25+35*25+25
b,58*42+32*8+5*16
c,(42*43+43*57+43)-360/4
d,(372-19*4)+(981/9-13)
e,456/2*8+456/3-102
Tính nhanh:
7.(-2)^3-60:15
125-(-75)+32-(48+32)
|-19|+(-20)+(-19)+12
8^3:[(5^2-1):3]-65+(-1)^2019
Nhanh lên nhá,ai làm nhanh đúng tớ cho 3 tick
Viết các tập hợp sau = cách nêu ra tính chất đặc trưng :
a) A = { 1 ; 4 ; 7 ; 10 ; 13 ; 16 ; 19 }
b) B = { 1 ; 8 ; 27 ; 64 ; 125 }
c) C = { 2 ; 6 ; 12 ; 20; 32 ; 42 }
a) 92/9 + 13/5 - 56/9
b) 58/7 - (31/9 + 30/7)
c) 2/3 + 1/3 x 9/4 - 13/12
d) 41/8 - 7/4 : 11/5
e) 478/19 : 5/4 - 668/19 : 5/4
f) 32/21 x 49/45 : 16/22 x 15/33
g) 2020x2018+9 / 2019x2020-2011.
Giup minh voi minh dang can gap!!!