Question

va rog din suflet sa rezolvați problemele din imaginea următoare dacă știți! repedeeee .....dau coroana!!!!

Answer 1

38.a+b=6 =>x=?: 4×a+3×X+4×b=66 =>



39.2×2+5×4+3×4+4=4+20+12+4=40 lei
40. 10+20+30.....+1230 => 2×(5+10+15....+615) => 2×(615×616):2=378,840:2=189,420
41. 7+14+21....+315 => 7×(1+2+3.....+45) => 7×(45×46):2= 7×2070:2= 14,490:2=7,245
42.3×(7×4)=3×28= 84 copii
43. 1×2×3×4....×25=(1×0),(2×5),(3×0),(4×5),(5×0),(6×5),(7×0),(8×5),(9×0),(10×5),(11×0),(12×5),(13×0),(14×5),(16×5),(17×0),(18×5),(19×0),(20×5),(21×0),(22×5),(23×0),(24×5),(25×0)=0,10,0,20,0,30,0,40,0,50,60,0,70,80,0,90,0,100,0,110,0,120, => 23 de zerouri
44.6×4=24 => 6+4=10
45.Scz,dar nu am stiut
46.100-(5×5+7×3+6×7)=100-(25+21+42)=100-88=12lei i-a ramas lui Sorin
47.X+99=99+99+...+99 =>
X+99=9×(11+11+11...+11)
X+99=9×(99×100):2
X+99=9×9900:2
X+99=90100:2
X+99=45050
X=45050-99
X=44951

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