a) 100-9:(372:3.y-1)-14=83
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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
A= 1+5+9+.....+2001
Số số hạng: (2001-1):4+1=501
Tổng là: (2001+1)x501:2=501501
a) B = [ ( 315 + 372 ) . 3 + ( 372 + 315 . 7 ] : ( 26 . 13 + 74 . 14 )
= [687.3+687.7]:1374=6870:1374=5
\(\dfrac{\left(315+372\right).3+\left(372+315\right).7}{26.13+74.14}\)
\(=\dfrac{\left(315+372\right)\left(3+7\right)}{2.13.13+74.2.7}\)
\(=\dfrac{687.10}{2\left(169+518\right)}\)
\(=\dfrac{6870}{2.687}=\dfrac{6870}{1374}=5\)
a, [ (315+372) .3 +(372+315).7] /26.13 +74.14
=[ (315+372) .(3+7) ] /26 .13 + 74 .13 +74
= [(315+372).10 ] / (26+74).13 +74
= 687 .10 / 100.13 +74
= 6870 /1374
den day ban tu rut gon
a, ( 372 + 300 ) : ( y x 3 ) = 8
672 : ( y x 3 ) = 8
y x 3 = 672 : 8
y x 3 = 84
y = 84 : 3
y = 28
b, 21 : ( y + 3 ) x 4 + 88 = 100
21 : ( y + 3 ) x 4 = 100 - 88
21 : ( y+3)x4 = 12
21 : ( y + 3 ) = 12 : 4
21 : ( y + 3 ) = 3
y + 3 = 21 : 3
y + 3 = 7
y = 7 - 3
y = 4
a) (372+300): (y x 3) =8
=> 672:8 = y x 3
=> 84 = y x 3
=> 84/3 = y
=> y = 28
b) 21:(y+3)x4 + 88 =100
=> 21: ( y+3) x 4=100-88
=>21 : (y+3) x 4 =12
=>21 : ( y+3 )=12/4
=>21 : (y+3)=3
=> 21/3=y+3
=>7=y+3
=>y=7-3
=>y=4
\(A=\left(315+372\right).3+\left(372+315\right).7\) \(26.13+74+14\)
\(A=\left(315+372\right).\left(3+7\right)\) \(=338+74+14\)
\(A=\left(315+372\right).10\) \(=412+14\)
\(A=687.10=6870\) \(=126\)
1. \(A=\left(315+372\right)\cdot3+\left(372+315\right)\cdot7\)
\(\Rightarrow A=\left(315+372\right)\cdot\left(3+7\right)\)
\(\Rightarrow A=687\cdot10\)
\(\Rightarrow A=6870\)
2. \(26\cdot13+74+14\)
\(=338+74+14=426\)
a) 100 - 9 : ( 372 : 3 .y - 1 ) -14 = 83
100 - 9 : ( 372 : 3 . y - 1 ) = 83 + 14
100 - 9 : ( 372 : 3 . y - 1 ) = 97
9 : ( 372 : 3 . y - 1 ) = 100 - 97
9 : ( 372 : 3 . y - 1 ) = 3
372 : 3 . y - 1 = 9 : 3
372 : 3 . y - 1 = 3
372 : 3 . y = 3 + 1
372 : 3 . y = 4
3 . y = 372 : 4
3 . y = 93
y = 93 : 3
y = 31
\(100-9:\left(372:3.y-1\right)-14=83\)
\(100-9:\left(372:3.y-1\right)=97\)
\(9:\left(372:3.y-1\right)=3\)
\(\left(372:3.y-1\right)=3\)
\(372:3.y=4\)
\(3.y=93\)
\(y=31\)