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( 315+372 ) . 3 + ( 372 + 315 )
= (315+315) + (372+372) . 3
= 630 + 744 . 3
= 1374 . 3
= 4122
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\(B=\frac{\left(315+372\right).3+\left(372+315\right).7}{26.13+74.14}=\frac{315.3+372.3+372.7+315.7}{26.13+74.14}=\frac{315.\left(7+3\right)+372.\left(7+3\right)}{26.13+74.14}=\frac{3150+3720}{26.13+74.14}\)
đến đấy bó tay
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\(\frac{\left(315+372\right).3+\left(372+315\right).7}{26.13+74.48}\)
\(=\frac{\left(315+372\right).\left(3+7\right)}{\left(26.13\right)+\left(74.48\right)}\)
\(=\frac{687.10}{39+3552}\)
\(=\frac{6870}{3890}=\frac{687}{389}\)
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{\left(315+372\right).3+\left(372+315\right).7}{26.13+74.14}\)
\(=\frac{\left(315+372\right)\left(3+7\right)}{26.13+74.13+74}\)
\(=\frac{687.10}{13\left(26+74\right)+74}\)
\(=\frac{6870}{13.100+74}=\frac{6870}{1300+74}\)
\(=\frac{6870}{1374}\)