\(1-\dfrac{25}{85}-\dfrac{13}{17}-\dfrac{9}{34}=-\dfrac{11}{34}\)
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Các câu hỏi tương tự
tính nhanh
7/12+5/12+2/17
109/17×213/217+3/112+221/217
12/17×21/25×34/12×25/42
25/34×3/13×34/50×26/2
57/20×13/17-17/20×13/17
2006/2007×2/7+1/2007×2/7
khó qua !!!!
a) 21/11 x 22/17 x 68/63
b) 5/14 x 7/13 x 26/25
c) 7/9 x 3/35 x 17/9
d) 11/17 : 33/34
e) 15,7 : 6,28
7/1*5+7/5*9+7/9*13+7/13*17+7/17*21
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+149+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39*100
tính nhanh :
7/1*5+7/5*9+7/9*13+7/13*17+7/17* 21
Tính Nhanh: b)(13/21*7/8-12/21*7/8)*12 c) 7/11+3/4+4/11+8/17+1/4+18/34
Tìm dẵy số 4 ,8 13 ,17 ,21 ,26 ,30 ,34 ,38... có quy luật ,cần tìm?
tìm x
(9-x)+(13-x)+(17-x)+...+(85-x)=925
13/2×27/5×2×34/9×2×2/17