a.
(5/11 + 6/11 ) + ( 1/4 +3/4) + ( 6/25 + 9/25)
= 11/11 + 4/4 + 15/25
= 1 +1 + 3/5
= 2+3/5 = 13/5
b.
( 37/100 + 163/100) + (1/8 + 3/8 ) + 19/4 + 1/2
= 200/100 + 4/8 + ( 19/4 + 2/4)
= 2 + 1/2 + 21/4
= 31/4
Thuc hien phep tinh sau bang cach hop li nhat:
a)5/11+1/2+2/5+6/11+3/4+16/25+5/16
b)19/4+37/100+1/8+132/25+5/2+37/12
Tính nhanh mỗi biểu thức sau:
a, 0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19 + 20
b, 1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 x 9 x (4 x 9 - 36)
c, (81 - 7 x 9 - 18) : (1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9)
d, (6 x 5 + 7 - 37) x (1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10)
e, (11 x 9 - 100 + 1) : (1 x 2 x 3 x 4 x ... x 10)
g, (m : 1 - m x 1) : (m x 2008 + m x 2008)
h, (2 + 4 + 6 + 8 + m x n) x (324 x 3 - 972)
l, (1 + 2 + 3 + ... + 99) x (13 x 15 - 12 x 15 - 15)
i, (0 x 1 x 2 x...x 99 x 100) : (2 + 4 + 6 +...+ 98)
k, (0 + 1 + 2 +...+ 97 + 99) x (45 x 3 - 45 x 2 - 45)
(Chú ý : trong tất cả các phép tính trên đều không có số âm)
bài 1
4/7+4
3+6/11
3-5/7
21/9-2
15/24+2
63/45-20/25
3/4-2/8
6/7-5/8
37/45-5/9
46/39-11/13
5/12+3/4+1/3
1/2+3/7+11/14
7/10-(1/5+1/4)
15/4-2/3-3/4
Bài 1:Tính
a,3/2+5/4+5/8
b,4/5-3/8+2/4
c,3+6/8-5/4
d,5/6-1/2+2
e,3/5+6/11+7/13+2/5+16/11+19/13
g,75/100+18/21+29/32+1/4+3/21+13/32
Giusp mình nhé
Tính nhanh :
1/2 +3/4 + 5/6 + 7/8 + 9/10 + 10/11 + ....... + 99/100.
tính nhanh
1*2*3*4*5*6*7*8*9*10*11*12*...*99*100
Tính
A) 9+ 24/25
B) 1/20+ 1/4+ 2/5
C) 7/12+ 4
D) 10+ 9/8
E) 1/4+ 2/25+ 9/100
F) 28/90+ 6
G) 3/7+4/9+4/7+7/11
H) 1/8+1/12+3/8+5/12
11/15 + 8/15= Tính phân số
6/7 - 5/21=
25/4 x 16/100
7 x 2/49 =
4/3 : 2/9
5/8 : 25 =
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+...100=
