Răspuns :
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
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
a) 397+42*m=849
397+42m=849
42m=859-397
42m=462
m=462:12
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 = 500 + 300
40*p = 800
p= 800 : 40
p=20
397+42m=849
42m=859-397
42m=462
m=462:12
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 = 500 + 300
40*p = 800
p= 800 : 40
p=20