8/3 + 17/9 + 19/13 + 1/3 + 7/13 + 1/9 = ( 8/3 + 1/3 ) + (17/9 + 1/9 ) + (19/13 + 7/13)
= 3 + 2 + 2
=7
tích cho mk nha , !!!
8/3 + 17/9 + 19/13 + 1/3 + 7/13 + 1/9 = ( 8/3 + 1/3 ) + (17/9 + 1/9 ) + (19/13 + 7/13)
= 3 + 2 + 2
=7
tích cho mk nha , !!!
Tính nhanh
a) 8/3 + 17/9 + 19/13 + 1/3 + 7/13 +1/9
b)1/2 + 1/4 + 1/8 + 1/16 + 1/32
tính bằng cách thuận tiện nhất
2/3+7/13-17/9+19/13-1/9+7/3
ai giúp em câu này đi
a,6/1*3*7+6/3*7*9+6/7*9*13+6/9*13*15+6/13*15*19
b,1/1*3*7+1/3*7*9+1/7*9*13+1/9*13*15+1/13*15*19
c,1/2*4*6+1/4*6*8+1/6*8*10+1/8*10*12*14+...+1/96*98*100
d,5/1*5*8+5/5*8*12+5/8*12*15+...+5/33*36*40
* là dấu nhân / là phần nha
x : 9/5 = 1/2
8/3 :x = 1/2
9/14 - 2/5 : 4/5
15/13 * 12/19 + 15/13 * 7/9
47/30 : 5/7 - 17/30 * 5/7
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10
2 + 4 + 6 + 8 + 10 + 12 + 14 + 16 + 18 + 20
1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19
tính nhanh
1+1+2+2+3+3+4+4+5+5+6+6+7+7+8+9+8+9+10+12+13+14+15+16+17+18+19+20+30+1000000=?
4/6+7/13+17/9+19/13-8/9+1/6
hay cho biet hang don vi tim duoc khi thuc hienday tinh sau :
1*3*5*7*9*...*13*15*17*19+1*2*3*...*8*9
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20=?