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a) 1,26 : x + 2,34 : x =5
\(1,26\times\frac{1}{x}+2,34\times\frac{1}{x}=5\)
\(\frac{1}{x}\times\left(1,26+2,34\right)=5\)
\(\frac{1}{x}\times3,6=5\)
\(\frac{1}{x}=5:3,6\)
\(\frac{1}{x}=\frac{18}{25}\)
\(x=\frac{25}{18}\)
b) \(x\times3,1+x\times6,9=30,4\)
\(x\times\left(3,1+6,9\right)=30,4\)
\(x\times10=30,4\)
\(x=30,4:10\)
\(x=3,04\)
c) \(x:1,5+0,45=7,65\)
\(x:1,5=7,65-0,45\)
\(x:1,5=7,2\)
\(x=1,5\times7,2\)
\(x=11,1\)
Chúc bn học tốt !
x . 4,5 + 2,4 . x = 68,43 - 9,78
x . ( 4,5 + 2,4 ) = 68,43 - 9,78
x . 6,9 = 58,65
x = 58,65 : 6,9
x = 8,5
a) 60,36 : x + 43,14 : x = 45
(60,36 + 43,14) : x = 45
103,5 : x = 45
x = 103,5: 45
x = 2,3
b) 12,3 : x x 4,5 = 6
x x 4,5 = 12,3 : 6
x x 4,5 = 2,05
x = 2,05 : 4,5
x = 41/90
c) x x 4 x 3,75 = 36
x x 15 = 36
x = 36 : 15
x = 2,4
d) 135 : x : 12 = 4,5
x : 12 = 135 : 4,5
x : 12 = 30
x = 30 x 12
x = 360
tớ nhah nhất , ủng hộ nha
a) 4,5 x 5,5 + 4,7 x 4,5
=4,5 x (5,5 +4,7)
=4,5 x 10,2
= 45,9
b) 7,5 x 2,5 x 0,04
=7,5 x (2,5 x 0,04)
=7,5 x 0,1
=0,75
c) 73,5 x 35, 64 ÷ 73,5 x 64,36
=73,5 x(35,64+64,36)
= 73,5 x 100
= 7350
d) 3,12 x 8 x 1,25
=3,12 x (8 x 1,25)
=3,12 x 10
= 31,2
e)6,48 x 11, 25 - 6,48 x 1,25
=6,48 x (11,25 -1,25)
= 6,48x 10
=64,8
f)3,67 x 58,35 + 58,35 x 6,33
=58,35 x (3,67+6,33)
= 58,35x 10
=583,5
You're welcome :))
A) \(4,5\times5,5+4,7\times4,5\)
\(=4,5\times\left(5,5+4,7\right)\)
\(=4,5\times10,2\)
\(=45,9\)
B) \(7,5\times2,5\times0,04\)
\(=7,5\times\left(2,5\times0,04\right)\)
\(=7,5\times0,1\)
\(=0,75\)
C) \(73,5\times35,64+73,5\times64,36\)
\(=73,5\times\left(35,64+64,36\right)\)
\(=73,5\times100\)
\(=7350\)
D) \(3,12\times8\times1,25\)
\(=3,12\times\left(8\times1,25\right)\)
\(=3,12\times10\)
\(=31,2\)
E) \(6,48\times11,25-6,48\times1,25\)
\(=6,48\times\left(11,25-1,25\right)\)
\(=6,48\times10\)
\(=64,8\)
F) \(3,67\times58,35+58,35\times6,33\)
\(=\left(3,67+6,33\right)\times58,35\)
\(=10\times58,35\)
\(=583,5\)
* Lần sau bạn tách câu hỏi ra để dễ giải hơn nhé *
Hc tốt
@Duongg
vì A+A+A+A=76
Suy ra A= 76:4
A=19
B=475:19
B=25
C=5700:475
C=12
D=159600:5700
D=28
Suy ra E=159623-159600
E=23
Vậy A=19
B=25
C=12
D=28
E=23
\(a,x-1,27=3,4\\ =>x=3,4+1,27\\ =>x=4,67\\ b,x+2,34=7,65\\ =>x=7,65-2,34\\ =>x=5,31\\ c,x-2,4=7,89-4,5\\ =>x-2,4=3,39\\ =>x=3,39+2,4\\ =>x=5,79\\ d,x+3,1=4,6+3,2\\ =>x+3,1=7,8\\ =>x=7,8-3,1\\ =>x=4,7\)
`a)x-1,27=3,4`
`x=3,4+1,27`
`x=4,67`
___________________________________________________
`b)x+2,34=7,65`
`x=7,65-2,34`
`x=5,31`
___________________________________________________
`c)x-2,4=7,89-4,5`
`x-2,4=3,39`
`x=3,39+2,4`
`x=5,79`
___________________________________________________
`d)x+3,1=4,6+3,2`
`x+3,1=7,8`
`x=7,8-3,1`
`x=4,7`