7260-120:24.y+924=528.3
Bài 4: Tìm y
a) 100-9:(372:3.y-1)-14=83
b) 7260-120:24.y+924=528.3
c) 2000-52:(615:3:y-15)-14=1984
d) y+y.1/3+5/18=7/18
e) 13/15-(5/21+y).7/12=7/10
h) y+2.y+3.y+4.y+...+10.y=49,5
i) y.(1975/8.9+1885/9.10+1755/10.11+1579/11.12+6=1/24
a)100-9:(372:3.y-1)-14=83
<=>100-9:(124y-1)-14=83
<=>86-9:(124y-1)=83
<=>9:(124y-1)=3
<=>124y-1=3
<=>124y=4
<=>y=\(\frac{1}{31}\approx0,3223\)
b)7260-120:24.y+924=528,3
<=>8184-5y=528,3
<=>5y=7655,7
<=>y=1531,14
c)2000-52:(615:3:y-15)-14=1984
<=>1986-52:(205:y-15)=1984
<=>52:(205:y-15)=2
<=>205:y-15=26
<=>205:y=41
<=>y=5
d)y+y.1/3+5/18=7/18
<=>4/3y=1/9
<=>y=1/12
e)13/15-(5/21+y)7/12=7/10
<=>7/12.(5/21+y)=1/6
<=>5/36+7/12y=1/6
<=>7/12y=1/36
<=>y=1/21\(\approx\)0,4762
h)y+2.y+3.y+...+10.y=49,5
<=>55y=49,5
<=>y=0,9
i)y.(1975/8.9+1885/9.10+1755/10.11+1579/11.12)=1/24
<=>7991,364899y=1/24
<=>y=33/6329161
tích nha mỏi tay quá
Kết quả của phép nhân 1815 x 4 là:
A. 4240 B. 7260 C. 7240 D. 4260
Tiim uoc chung lon nhat roi tim tap hop cac uoc chung cua cac so sau
A, 12 , 18, 24
B, 2100 va 924
a) 12 = 22 . 3
18 = 2 . 32
24 = 23 . 3
ƯCLN(12,18,24) = 2 . 3 = 6
ƯC(12,18,24) = Ư(6) = {1;2;3;6}
b) 2100 = 22 . 3 . 52 . 7
924 = 22 . 3 . 7 . 11
ƯCLN(2100,924) = 22 . 3 . 7 = 84
ƯC(2100,924) = Ư(84) = {1;2;3;4;6;7;12;14;21;28;42;84}
TL:
a) 12 = 22 . 3
18 = 2 . 32
24 = 23 . 3
ƯCLN(12,18,24) = 2 . 3 = 6
ƯC(12,18,24) = Ư(6) = {1;2;3;6}
b) 2100 = 22 . 3 . 52 . 7
924 = 22 . 3 . 7 . 11
ƯCLN(2100,924) = 22 . 3 . 7 = 84
ƯC(2100,924) = Ư(84) = {1;2;3;4;6;7;12;14;21;28;42;84}
HT
giải hệ pt sau: \(\hept{\begin{cases}-x+y=-24\\\frac{120}{x}-\frac{120}{y}=\frac{5}{6}\end{cases}}\)
1. Phép chia 24 650 : 120
A. 24 650 : 120 = 25 (dư 50) C. 24 650 : 120 = 25 (dư 5)
b. 24 650 : 120 = 205 (dư 50) D. C. 24 650 : 120 = 205 (dư 5)
1. Phép chia 24 650: 120
A. 24 650: 120 = 25 (dư 50) C. 24 650: 120 = 25 (dư 5)
b. 24 650: 120 = 205 (dư 50) D. C. 24 650: 120 = 205 (dư 5)
giúp mình nha
Tính nhanh: \(\frac{1}{4}+\frac{1}{12}+\frac{1}{24}+.....+\frac{1}{924}\)
b. \(\frac{5}{2.1}+\frac{4}{1.11}+\frac{3}{11.2}+\frac{1}{2.15}+\frac{13}{15.4}\)
A= 5/2.1 + 4/1.11 + 3/11.2 + 1/2.15 + 13/5.4
A/7 = 5/2.7 + 4/7.11 + 3/11.13 + 1/14.17 + 13/ 17.20
A/7= 1/2 - 1/7 +1/7 - 1/11 + 1/11 -1/13 + 1/14 - 1/17 + 1/17- 1/20
A/7= 1/2-1/20
A/7= 9/20
A= 9/20 .7
A= 63/20
924:22= Dư