\(\dfrac{13}{17}.\dfrac{5}{8}+\dfrac{4}{17}.\dfrac{10}{16}\)
\(=\dfrac{65}{136}+\dfrac{4}{17}.\dfrac{10}{16}\)
\(=\dfrac{65}{136}+\dfrac{5}{34}\)
\(=\dfrac{65}{136}+\dfrac{170}{136}\)
\(=\dfrac{235}{136}\)
tính nhanh
1+3+5+7+9+11+13+15
2+4+6+8+10+12+14+16
1+4+7+10+13+16+16+22
1+5+9+13+17+21+25+29+33+37
cứu mình với.HELP ME!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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
Câu 3.tính
a, 74,15 + 4,05 : 2,5
b, 100 - 2,6 × 3,9 + 20,97
Câu 4.tính nhanh
a, 1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64
b, 3333/4545 + 36/45 + 666666/454545
c, 32,61 + 4,28 + 45,35 + 67,39 + 572-25,35
d, 4/7 + 46/13 + 25/8 + 3/7 - 1/8 - 7/13
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=?
Tính nhanh:
12 - 13 + 14 - 15 + 16
18 - 16 + 14 - 12 + 10 - 8
Tính nhanh
a) 1+3+5+7+9+11+13+15+17+19
b) 4+8+12+16+.....+200
c) 2+4+6+8+...+98+100- (1+3+5+...+97+99)
1) Tính nhanh
a) 3/8 + 7/12 + 10/16 + 10/24
b) 5/7 x 9/16 + 7/10 x 5/7
c) 4/6 + 7/13 + 17/9 + 19/13 + 1/9 + 14/6
d) 2005 x 2006 - 1/2004 x 2006 + 2005
Tính nhanh:
58 x 42 + 32 x 8 + 5 x 16 ( 372 - 19 x 4 ) + ( 981 : 9 - 13 )
TÍNH NHANH
19/13 -14/16 - 4/6 - 7/13 - 17/9
Tính nhanh:
a) 58 x 42 + 32 x 8 + 5 x 16
b) ( 42 x 43 + 43 x 57 + 43 ) - 360 : 4 c) ( 372 - 19 x 4 ) + ( 981 : 9 - 13 )
