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a) 7,25×6,93+7,25×2,07+7,25×1
=7,25×(6,93+2,07+1)
=7,25×10
=72,5
b) 24,8:0,5+24,8×8
=24,8×2+24,8×8
=24,8×(2+8)
=24,8×10
=248
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\(\Leftrightarrow x\times\left(7,25+27,5\right)=30\)
\(\Leftrightarrow x=\dfrac{30}{34,75}=\dfrac{120}{139}\)
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X x 7,25 + 244,75=749,35
X x 7,25=749,25 - 244,75
X x 7,25=504,5
X=504,5 : 7,25
X=69,5862069
X x 7,25 + 2,75 x 89 = 149,87 x 5
X x 7,25 + 2,75 x 89 = 749,35
X x 7,25 + 2,75 = 749,35 : 89
X x 7,25 + 2,75 = 8,41
X x 7,25 = 8,41 - 2,75
X x 7,25 = 5,66
X = 5,66 : 7,25
X = 0,78
Vậy X = 0,78
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![](https://rs.olm.vn/images/avt/0.png?1311)
246,5 : (X x 5) = 7,25
X x 5 = 246,5 : 7,25
X x 5 = 34
X = 34 : 5
X = 6,8
20,49 + x = 7,25 x 6,28
20,49 + x = 45,53
x = 45,53 - 20,49
x = 25,04