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y . 3 + y . 2 + y . 4 + y . 4 - 125 = 325
y . ( 3 + 2 + 4 + 4 ) - 125 = 325
y . ( 3 + 2 + 4 + 4 ) = 325 + 125
y . 13 = 450
y = 450 : 13
y = 34,61538462
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y+1+y+2+y+3+y+4+y+5+y+6+y+7+y+8+y+9+y+10=y x 10 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 +10
= y x 10 + 55
Dạng tổng quát là như thế!
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a)y x (3+5+1)=7829+289=8118
y x 9=8118
y=902
Vậy y=902
b)32+19-y=28
51-y=28
y=51-28
y=23
Vậy y=23
Học giỏi nhé!!! ^.^
a ) y x ( 3+5+1) = 7829 + 289
y x 9 = 8118
y = 8118 : 9 902
b ) 32 + 19 - y = 28
51 - y =28
y = 28 + 51
y = 79
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y x 4 + y x 3 - y x 2 = 45
y x (4+3-2)=45
y x 5=45
y=45:5
y=9
y x 4 + y x 3 - y x 2 = 45 Tick mik nhá !!!!!
y x ( 4 + 3 - 2 ) = 45
y x 5 = 45
y= 9
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a) 42:y=56:8 b) y:6+25=83 c) y:4=32(dư 3) d) y:7-45=18 e) 42:y=5(dư 2) g) 51:y=6(dư 3)
42:y=7 y:6=83-25 y=32*4+3 y:7=18+45 y=(42-2):5 y=(51-3):6
y=42:7 y:6=58 y=128+3 y:7=63 y=40:5 y=48:6
y=6 y=58*6 y=131 y=63*7 y=8 y=8
y=348 y=441
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Giai:
Vi x-4/y-3=4/3 <=>3(x-4)=4(y-3)
<=> 3x-12=4y-12
<=>3x=4y
=> x=4k va y =3k ( k thuoc Z , k khac 0)
ma x-y=5 => 4k-3k=5
=> k = 5
x = 4 . 5=20
y = 3.5 =15
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y x 3 + x x 3 = 60
( y + x ) x 3 = 60
y + x = 60 : 3
y + x = 20
y , x = 20 : 2
y , x = 10
y , x = 9
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y x 4 + y + y x 3 = 984
y x ( 4 + 1 + 3 ) = 984
y x 8 = 984
y = 984 : 8
y = 123
k cho mk nha