\(\frac{1}{7}+\frac{1}{6}=\frac{6}{42}+\frac{7}{42}=\frac{11}{42}\)
1. tính nhanh:
a. M = 7(62+1) (64+1)(68+1)(616+1)(632+1)
b.N=(72+1)(74+1)(78+1)(716+1)
tính
14/5 -7/5=
7/8 -1/3+5/4
7/6+2/15+5/6+13/15
4/3*5/11
2/9:6*1/4
tính nhanh
3/4*4/5*5/6*6/7*7/9
22/3*1/6+1/6*2/3
9*1/3-2/5*1/3-3/5*1/3
mọi người giúp em với ạ
1 1 1 = 6
2 2 2 = 6
3 3 3 = 6
5 5 5 = 6
6 6 6 = 6
7 7 7 = 6
a,x - 1/2 - (-1/6)
b,x + 5/6 = 3/8
c,2/3 . x -1/2 = 5/6
d, x/7 = 6/-21
e,(7/3 x -0,6) : 3^2/5 = 1
f,x/45 = 5/6 + -29/30
g,(4,5 - 2x) . (-1^4/7) =11/14
h,-2/7 + 4/7x=5/7
1/5+-1/6+1/7+-1/8+1/9+-1/7+1/6+-1/5=?
(5/7-7/7)-[0,2-(-2/7-1/10]
(3-1/4+2/3)-(5-1/3-5/6)-(6-7/4+-3/2)
1/3-3/4--3/5+1/64-2/9-1/3+1/15
3/5:(1/15-1/6)+3/5:(-1/3-16/15)
1/2(-3/4-13/14):5/7-(-2/21+1/7):7/7
1/5+-1/6+1/7+-1/8+1/9+1/8+-1/7+1/6+-1/5
a) 6/7 : ( 2/5 . 6/7)
b) 6/7 + 5/7 : 5 - 8/9
c) 6/7 + 5/8 . 1/5 - 3/16 . 4
d) -1/6 + 2/3 . -3/4 + 4/5
1*1+2*2+3*3+4*4+5*5+6*6+7*7+....+20*20
(1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9+1/10)*X = 1/9+2/8+3/7+.....+9/1
thank you
Thực hiện các phép tính sau
a) 7/10+6/10
b) -5/9+2/9
c)1/7+1 6/7
d) 3/13+10/3+1
e) 5/12-7/12
f) 7/6+5/6-1/6
g) -3/20+7/20-9/20
