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\(\text{2,43 . 4,54 + 2,16 . 4,54+ 4,59 . 5,46 }\)
\(=4,54.\left(2,43+2,16\right)+4,59.5,46\)
\(=\) \(4,54.\) \(4,59\) \(+4,59.5,46\)
\(=4,59.\left(4,54+5,46\right)\)
\(=4,59.10\)
\(=45,9\)
2,43 . 4,54 + 2,16 . 4,54 + 4,59 . 5,46
= 4,54 . (2,43 + 2,16) + 4,59 . 5,46
= 4,54 . 4,59 + 4,59 . 5,46
= 4,59 . (4,54 + 5,46)
= 4,59 . 10
= 45,9
= 3,8 x ( 4,54 + 5 , 46 ) + ( 3,6 - 2, 1 ) : 1,5
= 3,8 x 10 + 1,5 : 1,5
= 38 + 1
=39
\(\dfrac{12,48:0,5.6,25.4.2}{2.3,14.1,25:0,25.10}\)
= \(\dfrac{12,48.2.5.4.2}{2.3,14.1.4.10}\)
= \(\dfrac{12,48.2}{2.3,14}\) = \(\dfrac{12,48}{3,14}\) = \(\dfrac{6,24}{1,57}\)
\(\frac{12,48:0,5.6,25.4.2}{2.3,12.1,25:0,25.10}\)= \(\frac{12,48.2.6.25.4.2}{2.3,12.1,25.4.10}\)= \(\frac{3,12.4.2.1,25.5.4.2}{2.3,12.1,25.4.5.2}\)= \(4\)
12,48: 0,5 \(\times\) 6,25 \(\times\) 4 \(\times\) 2
= 12,48 \(\times\) 2 \(\times\) 2 \(\times\) (6,25 \(\times\) 4)
= 12,48 \(\times\)4 \(\times\) 25
= 12,48 \(\times\) 100
= 1248
12,48:0,5x6,25x4x2=24,96x6,25x4x2=24,96x(6,25x4x2)
=(24,96x100):2
=2496:2=1248
\(3,25+4,54-12,48\)
\(=7,79-12,48\)
\(=-4,69\)