Question

3 Dacă a × b = 18 iar c × a = 10 a) a × (b + c) : 7 = I calculează: b) a × (b − c) =​

Answer 1

Răspuns:

$a \times (b + c) \div 7 = \\ (a \times b + a \times c) \div 7 = \\ (18 + 10) \div 7 = 28 \div 7 \\ = 4 \\ b)a \times (b - c) = a \times b - a \times c \\ = 18 - 10 = 8$

Answer 2

Răspuns:

Explicație pas cu pas:

a × b = 18

c × a = 10

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a) a × (b + c) : 7 = ?

a × (b + c) : 7 = (a x b + a x c ) : 7 = (18 + 10) : 7 = 28:7 = 4

b) a × (b − c) = ?

a × (b − c) = a x b - a x c = 18 - 10 = 8