Question

efectuiaza in doua moduri:
5x(5+2)
8x(6-3)
(2+4)x9
(5-3)X6
(3+2+4)x10
(5+1+2)x9
8x(7-3)
10x(4+3-2)
mersi

Answer 1

5×5+2×5
8×6-8×3
2×9+4×9
5×6-3×6
3×10+2×10+4×10
5×9+1×9+2×9
8×7-8×3
10×4+10×3-10×2

Answer 2

5x(5+2)=5x7=35 (primul mod)
5x5+5x2=25+10=35 (al doilea mod)

8x(6-3)=8x3=24
8x6-8x3=48-24=24

(2+4)x9=6x9=54
2x9+4x9=18+36=54

(5-3)X6=2x6=12
5x6-3x6=30-18=12

(3+2+4)x10=9x10=90
3x10+2x10+4x10=30+20+40=90

(5+1+2)x9=8x9=72
5x9+1x9+2x9=45+9+18=72

8x(7-3)=8x4=32
8x7-8x3=56-24=32

10x(4+3-2)=10x5=50
10x4+10x3-10x2=40+30-20=50