15: 5 + 4: 2 - 3 + 1000000 - 3000 : 7 + 10
= 3 + 2 - 3 + 1000000 - \(\dfrac{3000}{7}\) + 10
= (3 - 3) + (1000000 + 10 + 2) - \(\dfrac{3000}{7}\)
= 1000012 - \(\dfrac{3000}{7}\)
= \(\dfrac{6997084}{7}\)
1+2+3+4+5+6+7+8+9+10..............+1000000.t
A=(1+2)x(3000+456) B=(2000+5)x(10-1)
C=(101-1)x(5000+40+7) D=(5000+47)x(90+10)
E=(3000+400+50+6)x3 G=(2+3+4)x(1935+70)
1.so sánh
1/2:2/3......2/3:1/2 4/7:2/5......4/7:3/5
4/15:4/7......2/5x10/3 5/6......15/18-11/18
2.viết số thích hợp vào ô trống
2/3=..../18 7/9=49/.... ..../5=18/15
..../3=10/15 5/9=..../45 49/56=7/....
6/8=42/.... 2/9=..../63 49/56=..../8
10/3...1/3. 10/6...3/8. 17/4...5/6. 1/3...5/9 5/8...7/5 3/4...15/6 10/9...10/11 7/8...7/2 15/9...3/8 15/7...15/8 16/5...16/7 25/11...1
tính nhanh:
a) 1/2*2/3 ; 5/6*6/7 ; 10/15*15/20 ;24/25*25/36
b)1/2*2/3*3/4*4/5*5/6*6/7*7/8*8/9*9/10
(15/4-5/4:5/2)×2/39
4/15+3/10:7/15-1/2
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
tính giá trị biểu thức
[a] 1/3-2/15+14/15
[b] 3/5 +4-6/7
[c] 1/7+2/9+3/10+7/9+6/7+7/10
[d]3/4+5/8-5/6
mình cần gấp,các bạn trả lời nhanh giúp mình với ạ
Bài 3 : Tính nhanh
A) 11/15 + 5/7 + 2/7 + 4/15
B) 17/10 + 1/2 - 7/10
