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x * 5,1 + x : 0,4 + x : 0,25 - 5,6 = 78,5
x * 5,1 + x * 2,5 + x * 4 = 78,5 + 5,6
x * ( 5,1 + 2,5 + 4 ) = 84,1
x * 11,6 = 84,1
x = 84,1 : 11,6
x = 7,25
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a) X x 7 = 5,6%
X = 5,6% : 7
X = 0,008
b) 42% : X = 6
X = 42% : 6
X = 0,07
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bài 1:
a)=8.5025
b)=123.1586022...
bài 2
a)x=5.255
b)x=394.85
c)x=14.075
d)x=617.5
\(\)Bài 1:
\(a)2,45\times\left(3,45+5,6\right)-13,67\)
\(=2,45\times9,05-13,67\)
\(=22,1725-13,67\)
\(=8,5025\)
\(b)46,75:\left(12,45-3,15\right)\times24,5\)
\(=46,75:9,3\times24,5\)
\(=\frac{935}{186}\times\frac{49}{2}\)
\(=\frac{45815}{372}\)
\(\)Bài 2:
\(a)18,355+x=23,61\)
\(x=23,61-18,355\)
\(x=5,255\)
\(b)225,35-x=169,5\)
\(x=225,35-169,5\)
\(x=55,85\)
\(c)x:2,5=5,63\)
\(x=5,63\times2,5\)
\(x=14,075\)
\(d)x:100=6,175\)
\(x=100\times6,175\)
\(x=6175\)
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a. x x 1,6 + x x 0,4 = 7
=> x x ( 1,6 + 0,4 ) = 7
=> x x 2 = 7
=> x = 3,5
b.x x 5,2 - x 1,2 =3
=> x x ( 5,2 - 1,2 ) = 3
=> x x 4 = 3
=> x = 0,75
c.x x 14 + 7/100 = 1141 , 07
=> x x 14 + 0,07 = 1141,07
=> x x 14 = 1141
=> x = 285,25
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a, 45,651 x ( 73 + 20 + 7 )
= 45,651 x 100
= 4565,1
b, 35 . 11 . 0,1 + 0,25 . 100 . 0
= 35 . 1,1 + 0
= 38,5
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Bài 1 :
a) 8,6 * x + x * 1,4 = 10
=> x * ( 8,6 + 1,4 ) = 10
=> x * 10 = 10
=> x = 1
b) 2009 x 2009 + 2010
= 2009 x 2009 x ( 2009 + 1 )
= 2009 x 2009 x 2009 + 2009 x 2009
= 20093 + 20092
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\(64,32.x+35,68.x=32\)
\(x.\left(64,32+35,68\right)=32\)
\(100x=32\)
\(x=\frac{32}{100}\)