Question

6 Află termenul necunoscut: a)
100-a×5=5×5. b ) a×2-76÷2=48:2; c)44-a÷2=7×2​

Answer 1

Răspuns:

$a) \: 100 - a \times 5 = \underline{5 \times 5} \\ 100 - 5a = 25 \\ - 5a = 25 - 100 \\ - 5a = - 75 \\ a = - 75 \div ( - 5) \\ \bf a = 15 \\ b) \: 2a - 76 \div 2 = 48 \div 2 \\ 2a - 38 = 24 \\ 2a = 24 + 38 \\ 2a = 62 \\ a = 62 \div 2 \\ \bf a = 31$

$c) \: 44 - a \div 2 = 7 \times 2 \\ 44 - a \div 2 = 14 \\ - a \div 2 = 14 - 44 \\ - a \div 2 = - 30 \\ - a = - 30 \times 2 \\ - a = - 60 \\ a = 60$