Объяснение:
2.1а - 2.1в( в - а ) Если а = 10.3 ; в = 5.3
2.1 × 10.3 - 2.1 × 5.3 ( 5.3 - 10.3) = 2.1(10.3 + 5.3 × 5) = 2.1 × 36.8 = 77.28
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Объяснение:
2.1а - 2.1в( в - а ) Если а = 10.3 ; в = 5.3
2.1 × 10.3 - 2.1 × 5.3 ( 5.3 - 10.3) = 2.1(10.3 + 5.3 × 5) = 2.1 × 36.8 = 77.28