Question

Observati modelul si apoi calculati .
8x8-8x5=8x(8-5)
=8x3=
=24
a)5x6-5x3
6x3-6x1
9x9-9x4
b)7x2+7x7
3x5+3x5
1x9+1x1

Answer 1

A)5(6-3)=5×3=15 6(3-1)=6×2=12 9(9-4)=9×5=45 b)7(2+7)=7×9=63 5(3+3)=5×6=30 1(9+1)=1×10=10

Answer 2

Direct rezolvarea:
5×6-3
5×3
15

6×3-1
6×2
12

9×9-4
9×5
45