a) 2 2/5 * 25/18
b) 9/11 : 2 5/2 * 2 3/4
c) 10 : 35/24 : 36/7
d) 10,77 * 9,8 + 5,23 * 9,8
e) 1,26 * 3,6 : 0,28 - 6,2
Giúp mình nhé
a) 2 2/5(hỗn số) * 25/18
b) 9/11 : 2 5/2(hỗn số) * 2 3/4(hỗn sỗ)
c) 10 : 35/24 : 36/7
d) 10,77 * 9,8 + 5,23 * 9,8
e) 1,26 * 3,6 : 0,28 - 6,2
22/5 x 25/18 =...........
9/11:2 5/2 x2 3/4=...........
10:35/24:36/7=............
10,77x9,8+5,23x9,8=.........
1,26x3,6:0,28-6,2 =................
Tính bằng cách thuật tiện nhất :
20/11 x 33/23 x 69/180=.................
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
2 2/5x25/18
9/11:2 2/5x2 3/4
10:35/24:36/7
2 2/5 *25/8
9/11 :2 2/5*2 3/4
10:35/24:36/7
20.77*9.8+5.23*9.87
1.26*36:0.28-6.2
BTT tr 123
Tính nhanh
A=1×5×6+2×10×12+24×8×10/1×35+2×6×10+8×6×20
B=2006×2008-3/2005+2005×2008
C=18×123+9×4567×2+3×5310×6/1+4+7+.......+55+58-410
Rút gọn rồi tính:
3/5-5/35 ; 18/27-2/6;15/25-3/21; 24/36-6/12
1 × 2 + 2 × 3 +3 × 4 + 4 × 5 + 5 × 6 + 6 × 7 + 7 × 8 + 8 × 9 + 9 × 10 + 10 × 11 +11 ×12 + 12 ×13 + 13×14 + 14×15 + 15×16 + 16×17 +17×18 + 18×19 + 19×20 + 20×21 + 21×22 + 22×23 + 23×24 + 24×25 + 25×26
