Question

Afla numarul necunoscut din exercitiile date a 397 plus 42 ×m=859 b 974 -124 :n=943 c 40xp-500=300

Answer 1

Răspuns

397+42m=859

42m=859-397

m=462:42

m=11

974-124:n=943

-124:n=943-974

-124:n=-31 (-1)

n=124:31

n=4

40p-500=300

40p=300+500

p=800:40

p=20

Answer 2

Răspuns

Explicație pas cu pas:

a)  

397 + 42 × m = 859

42 × m = 859 - 397

42 × m = 462

m = 462 : 42

m = 11

____________________

b)

974 - 124 : n = 943

124 : n = 974 - 943

124 : n = 31

n = 124 : 31

n = 4

___________________

c)

40 × p - 500 = 300

40 × p = 300 + 500

40 × p = 800

p = 800 : 40

p = 20