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450x0,45 + 1,5x30x3 + 5x9x2,5
= 450x0,45 + 4,5x30 + 45x2,5
= 450x0,45 + 0,45x300 + 0,45x250
= 0,45x(450 + 300 + 250) = 0,45x1000 = 450
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1,5 x 3 + 2,5 x 3 + 3,5 x 3 + 4,5 x 5
= 1,5 x 3 + 2,5 x 3 + 3,5 x 3 + 3 x 7,5
= 3 x (1,5 + 2,5 + 3,5 + 7,5)
= 3 x 15
= 45
1,5 x 3 + 2,5 x 3 + 3,5 x 3 + 4,5 x 5
= 1,5 x 3 + 2,5 x 3 + 3,5 x 3 + 3 x 1,5 x 5
= 1,5 x 3 + 2,5 x 3 + 3,5 x 3 + 3 x 7,5
= 3 x ( 1,5 + 2,5 + 3,5 + 7,5 )
= 3 x 15
= 45
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\(x.2,5-x.1,5=5\)
\(x.\left(2,5-1,5\right)\)\(=5\)
\(x.1=5\)
\(x=5:1\)
\(x=5\)
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\(\left(x:1,5\right)+0,45=7,65\)
=>\(x:1,5=7,65-0,45\)
=>\(x:1,5=7,2\)
=>\(x=7,2\times1,5\)
=>\(x=10,8\)
Vậy x = 10,8
(x:1,5)+0,45=7,65(x:1,5)+0,45=7,65
=>x:1,5=7,65−0,45x:1,5=7,65−0,45
=>x:1,5=7,2x:1,5=7,2
=>x=7,2×1,5x=7,2×1,5
=>x=10,8x=10,8
Vậy x = 10,8
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a) x + X x 1,5 + X x 2,5 = 3,75
X x( 1 +1,5 +2,5 ) = 3,75
X x 5 = 3,75
x= 3,75 : 5
x= 0,75
b) X x 3 +x: 5 = 6,4
X x 3 + x x 0,2 = 6, 4
X x( 3 + 0,2) = 6,4
X x 3,2 = 6,4
x= 6,4 : 3,2
x= 2
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2 : x - 1,25 : x = 1,5
(2-1,25):x= 1,5
0,75 :x = 1,5
x= 0,75 : 1,5
x= 0,5
1,2 : x * 4 , 5 = 6
1,2 :x = 6 : 4,5
1,2 :x = 4/3
x= 1/2 : 4/3
x= 3/8
1,5 : 4,5 * x = 2,5
1/3x= 2,5
x= 2,5 : 1/3
x= 15/2
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\(1,23:x-0,45:x=1,5\)
\(\Leftrightarrow\left(1,23-0,45\right):x=1,5\)
\(\Leftrightarrow0,78:x=1,5\)
\(\Leftrightarrow x=0,52\)
Vậy \(x=0,52\)
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`x xx2+x xx3=4`
`x xx(2+3)=4`
`x xx5=4`
`x=4:5=4/5`
_______________________
`x xx9-1,5=30`
`x xx9=30+1,5`
`x xx 9=31,5`
`x=31,5:9`
`x=3,5`
mà thui bạn thì tao giúp
450x0,45+1,5x30x3+5x9x2,5
=45x(10x0,45)+1,5x30x3+5x9x2,5
=45x4,5+45x3+45x2,5
=45x(3+45+2,5)
=45x10
=450
Lần sao tự làm nghe
quỳnh ơi cái cách ở 9 với 2,5 là j