Question

Scrie exercițiile, după model, apoi rezolvă:

a) MODEL: 8 x 4 + 8 x (4 + 15 ) = 8 x 19 = 152

3 x 3 + 3 x 23 = ________________________
5 x 4 + 5 x 11 =_________________________
9 x 8 - 5 x 9 =__________________________
9 x 12 - 9 x 2 =_________________________
6 x 5 - 6 x 3 =__________________________
10 x 9 - 10 x 5 =________________________

b) MODEL: 11 x 6 = ( 10 x 6 ) + ( 1 x 6 ) = 60 + 6 = 66

18 x 8 =______________________________
12 x 5 =______________________________
37 x 6 =______________________________
9 x 45 =______________________________
36 x 4 =______________________________
13 x 3 =_______________________________
Vă rog să mă ajutați!​

Answer 1

Răspuns:

3 x 3 + 3 x 23=4x(3+23)=4x26=106

5 x 4 + 5 x 11 =5x(4+11)=5x15=75

9 x 8 - 5 x 9 =9x(8-5)=9x3=27

9 x 12 - 9 x 2 =9x(12-2)=9x10=90

6 x 5 - 6 x 3 =6x(5-3)=6x2=12

10 x 9 - 10 x 5=10x(9-5)=10x4=40

18 x 8 =(10x8)+(8x8)=80+64=144

12 x 5 =(10x5)+(2x5)=50+10=60

37 x 6 =(30x6)+(7x6)=180+42=222

9 x 45 =(9x40)+(9x5)=360+45=405

36 x 4 =(30x4)+(6x4)=120+24=144

13 x 3=(10x3)+(3x3)=30+9=39