Question

verifică egalitățile :a )15 × 15 +20 ×20 +25 ×25 = 35 × 35 + 5 ×5 b) 10 ×10 +20 ×20 + 25 × 25 + 30 ×30 = 45 × 45 c )20 × 20 +35 ×35=40×40+5×5​

Answer 1

Răspuns:

15×15+20×20+25×25=

225+400+625

625+625=

1250

35×35+5×5

1225+25

1250

10×10+20×20+25×25+30×30+45×45=

100+400+625+900+2025=

500+625+900+2025=

1125+900+2025=

2025+2025=

4050

20×20+35×35+40×40+5×5=

400+1225+1600+25=

1625+1600+25=

3225+25=

3250