tính
2/5+1/4 1/3+3/5 1/2+1/4 1/8+5/6
ai lm nhanh e tick cho
tính
2/5+1/4 1/3+3/5 1/2+1/4 1/8+5/6
ai lm nhanh e tick cho
`2/5+1/4`
`=8/20+5/20`
`=13/20`
__
`1/3+3/5`
`=5/15+9/15`
`=14/15`
__
`1/2+1/4`
`=2/4+1/4`
`=3/4`
__
`1/8+5/6`
`=6/48+40/48`
`=46/48`
`=23/24`
2/5 + 1/4
= 8/20 + 5/20
= 13/20
1/3 + 3/5
= 5/15 + 9/15
= 14/15
1/2 + 1/4
= 2/4 + 1/4
= 3/4
1/8 + 5/6
= 6/48 + 40/48
= 46/48
= 23/24
Tính nhanh bằng cách rút gọn rồi tính:
a.(1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9)-(1/3+1/4+1/5+1/6+1/7+1/8+1/9+1/10)
b.(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)+(1/7-1/8)
Ai nhanh mình tick cho!
a) 1/2
b) 3/8
~~~~~~~~~hok tốt~~~~~~~~~~~~
A/ \(\frac{1}{2}\)
B/ \(\frac{3}{8}\)
Tính nhanh
a. 10 – 9 + 8 – 7 + 6 – 5 + 4 – 3 + 2 – 1
b. 1 + 3 + 5 + 7 + 9 + 10 + 8 + 6 + 4 + 2 + 0
ai tick cho mk mk tick lại cho
a. 10 – 9 + 8 – 7 + 6 – 5 + 4 – 3 + 2 – 1
= (10 – 9) + (8 – 7) + (6 – 5) + (4 – 3) + (2 – 1)
= 1 + 1 + 1 + 1 + 1
= 5
b. 1 + 3 + 5 + 7 + 9 + 10 + 8 + 6 + 4 + 2 + 0
= (0 +10) +(1 + 9) + (2 + 8) + (3 + 7) + (4 + 6) + 5
= 10 + 10 + 10 + 10 + 10 + 5
= 55
a) 10 - 9 + 8 - 7 + 6 - 5 + 4 - 3 + 2 - 1
= (10 - 9) + (8 - 7) + (6 - 5) + (4 - 3) + (2 - 1)
= 1 + 1 + 1 + 1 + 1
= 1 x 5
= 5
b) 1 + 3 + 5 + 7 + 9 + 10 + 8 + 6 + 4 + 2 + 0
= 0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10
= (0 + 10) x 11 : 2
= 10 x 11 : 2
= 5 x 11
= 55
1+1+1+1+1=...?
2+2+2+2+2=...?
3+3+3+3+3=...?
4+4+4+4+4=...?
5+5+5+5+5=...?
6+6+6+6+6=...?
7+7+7+7+7=...?
8+8+8+8+8=...?
9+9+9+9+9=...?
Ai nhanh mk tick cho
1+1+1+1+1=...?
2+2+2+2+2=...?
3+3+3+3+3=...?
4+4+4+4+4=4x5=20
5+5+5+5+5=5x5=25
6+6+6+6+6=6x5=30
7+7+7+7+7=7x5=35
8+8+8+8+8=8x5=40
9+9+9+9+9=9x5=45
1+1+1+1+1=5
2+2+2+2+2=10
3+3+3+3+3=15
4+4+4+4+4=20
5+5+5+5+5=25
6+6+6+6+6=30
7+7+7+7+7=35
8+8+8+8+8=40
9+9+9+9+9=45
Tính nhanh :
M = ( 1/1*2 + 1/ 3*4 + 1/4*5 + 1/5*6 + 1/7*8 + 1/9*10) - ( 1/6 + 1/7 + 1/8 + 1/9 + 1/10)
ai nhanh mik tick
Tính nhanh:
S = 1 - 2 + 3 - 4 + 5 - 6 + ... + 199 - 200
S = 1 + 2 - 3 - 4 + 5 + 6 - 7 - 8 + ... + 97 + 98 - 99 - 100 + 101
Ai giải nhanh nhất mk hứa sẽ tick cho!
S=(1-2)+(3-4)+(5-6)+...+(199-200)
S=(-1)+(-1)+...+(-1)
S=(-1).100=-100
S=1+(2-3)+(-4+5)+...+(98-99)+(-100+101)
S=1+(-1)+1+..+(-1)+1
S=1+25.(-1)+25.1
S=1+(-25)+25
S=1+0
=1
S= 1+(1-3)+3+(1-5)+5+(1-7)+........+199+(1-199)=200
1+2+3+4+5+6+7+8+9+1+2+3+4+5+6+7+8+9=?
Ai nhanh nhất mình tick cho nha...............
1+2+3+4+5+6+7+8+9+1+2+3+4+5+6+7+8+9
=(1+2+3+4=5=6=7+8+9)x2
=45x2
=90
Chúc bạn học giỏi nha!!!
1+1+1+1+1+1+2+2+2+2+2+2+2+3+3+3+4+4+4+5+6=5+7+7+6=8+9+9+8+7=
ai nhanh minh tick