Răspuns :
1)40:2+40:4=20+10=30
2)(18:2):(36:4)=9:9=1
3) a- b=45
a: b=6
a=6 b
6 b- b=45
5 b=45
b=45:5=9
a=6•9=54
54+9=63
4)P=36 m
P=4 l
36=4 l
l=36:4=9
5)6•9=54
60-6=54
6)50:5=10
50•5=250
10+250=260
7)987654
2)(18:2):(36:4)=9:9=1
3) a- b=45
a: b=6
a=6 b
6 b- b=45
5 b=45
b=45:5=9
a=6•9=54
54+9=63
4)P=36 m
P=4 l
36=4 l
l=36:4=9
5)6•9=54
60-6=54
6)50:5=10
50•5=250
10+250=260
7)987654
a)40:2 + 40:4 = 20 + 10 =30
b)18:2 =9 ; 36:4 =9
9:9 =1
c) a-b =45
a:b=6 => a = 6 x b
a+b=?
6 x b - b = 45 => 5 x b = 45 => b= 45:5 = 9
a = 6 x b = 6 x 9 = 54
a + b = 54 + 9 = 63
d)P = 36 m
P = 4 x l => l = P : 4 = 36 : 4 = 9
e) 6 x 9 = 54 ; 60 - 6 = 54
60 - 54 = 6
f) 50 : 5 = 10
50 x 5 = 250
10 + 250 = 260
g) 987654
b)18:2 =9 ; 36:4 =9
9:9 =1
c) a-b =45
a:b=6 => a = 6 x b
a+b=?
6 x b - b = 45 => 5 x b = 45 => b= 45:5 = 9
a = 6 x b = 6 x 9 = 54
a + b = 54 + 9 = 63
d)P = 36 m
P = 4 x l => l = P : 4 = 36 : 4 = 9
e) 6 x 9 = 54 ; 60 - 6 = 54
60 - 54 = 6
f) 50 : 5 = 10
50 x 5 = 250
10 + 250 = 260
g) 987654