Tim y
a,( 372 + 300 ) : ( y x 3 ) = 8
b,21 : ( y + 3 ) x 4 + 88 = 100
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21 : (y + 3) x4=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
21 : (y+3)x4=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
Đáp số y=4
\(21:\left(y+3\right)\times4+88=100\)
\(21:\left(y+3\right)\times4=100-88\)
\(21:\left(y+3\right)\times4=12\)
\(21:\left(y+3\right)=12:4\)
\(21:\left(y+3\right)=3\)
\(y+3=21:3\)
\(y+3=7\)
\(y=7-3\)
\(y=4\)
1:
a: Vì \(\dfrac{-4}{3}=\dfrac{-4\cdot3}{3\cdot3}=\dfrac{-12}{9}=\dfrac{12}{9}\\ \Rightarrow\dfrac{-4}{3}=\dfrac{12}{9}\)
b: Vì : \(-2\cdot3=-6\\ -6\cdot8=-48\)
nên 2 p/s ko bằng nhau
4x=3y
=>x/3=y/4
=>x2/9=y2/16=(x2+y2)/(9+16)=100/25=4 (dùng tính chất dãy tỉ số bằng nhau)
x2/9=4=>x2=36=>x=6 hoặc x=-6
y2/16=4=>y2=64=>y=8 hoặc y=-8
1)a)=>x2+y2+2xy-4(x2-y2-2xy)
=>x2+y2+2xy-4.x2+4y2+8xy
=>-3.x2+5y2+10xy
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, ( 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