Question

7 calculeaza in doua moduri. 7 x (3+5)= 6x(4+6)= 9x(1+3)= 8x(4+2)= ; 5x(9-7)= 4x(8-2)= 3x(4-3)= 6x(2-2)= .

Answer 1

7x(3+5)=7x8=56
7x(3+5)=7x3+7x5=21+35=56
6x(4+6)=6x10=60
6x(4+6)=6x4+6x6=24+36=60
9x(1+3)=9x4=36
9x(1+3)=9x1+9x3=9+27=36
8x(4+2)=8x6=48
8x(4+2)=8x4+8x2=32+16=48
5x(9-7)=5x2=10
5x(9-7)=5x9-5x7=45-35=10
4x(8-2)=4x6=24
4x(8-2)=4x8-4x2=32-8=24
3x(4-3)=3x1=3
3x(4-3)=3x4-3x3=12-9=3
6x(2-2)=6x0=0
6x(2-2)=6x2-6x2=12-12=0