15/17=30/34
15*34=17*30
510/510=1
2)8/30=0,4/1,5
12/12=1
3)0,9/7,1=9/71
0.9*71=7,19
63.9/63.9=1
4)0.6/1,3=3,6/7,8
0,6*7,8=1,3*3,6
4,68/4.68=1
9x²y³ - x²y³ - 10x²y³ = - 2x²y³
(3x²y)⁴ * (3xy³)² = 81x⁸y⁴ * 9x²y⁶ = 729x¹⁰y¹⁰
(2m²n + 3xy²)² = (2m²n)² + 2 * 2m²n * 3xy² + (3xy²)² = 4m⁴n² + 12m²nxy² + 9x²y⁴
(3k²p² + 2x³y³)² = (3k²p²)² + 2 * 3k²p² * 2x³y³ + (2x³y³)² = 9k⁴p⁴ + 12k²p²x³y³ + 4x⁶y⁶
А)430-(23+3)=404
б)250+(360-60)=550
в)(300+320)+250=870