3,1+2,34>x>1,75+2,4
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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 !
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a)8,704<8,714
18,27>18,17
b)2,349>2,348
9,469>9,468
c)48,070=48,07
98,090=98,09
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a)59,376<59,377<60,999
b)15,038>15,037>14,83
c)0,501<0,502<1,75
d)101,24>101,23>100,99
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a, 84,96 x 12,5 + 42,48 x 9,25 x 2 - 21,24 x 1,75 x 4
= 84,96 x 12,5 + 42,48 x 2 x 9,25 - 21,24 x 4 x 1,75
= 84,96 x 12,5 + 84,96 x 9,25 + 84,96 x 1,75
= 84,96 x ( 12,5 + 9,25 - 1,75 )
= 84,96 x 20
= 1699,2
b, 4,8 x 12,5 + 0,6 x 9,25 x 8 - 2,4 x 1,75 x 2
= 4,8 x 12,5 + 0,6 x 8 x 9,25 - 2,4 x 2 x 1,75
= 4,8 x 12,5 + 4,8 x 9,25 - 4,8 x 1,75
= 4,8 x ( 12,5 + 9,25 - 1,75)
= 4,8 x 20
= 96
Hok tốt !
3,1+2,34>x>1,75+2,4
=>5,44>x>4,15
=>4,15<x<5,44