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Află nr necunoscutdin exercitiile date.
a. 397+ 42 × m = 859
b. 974-124 : n = 943
c. 40× p - 500= 300


Răspuns :

a)397+42x m=859
42xm=859-397
42xm=462
M=462:42
M=11
397+42m=859
42m=859-397
42m=562
m=562:42
m=11

974-124:n=943
974-943=124:n
124:n=31
n=124:31
n=4

40xp-500=300
40p-500=300
40p=500+300
40p=800
p=800:40
p=20