Question

ajutor! va rog!dau 30 de puncte,doar rezolvati cateva din aceste exercitii:

scoate factorul comun,apoi calculeaza: 5x13-5x3;

19+19x9; 23x11-23; 7x8+2x7+10x7 41x132-41x32; 37x28+42x37-37x15;

27x+2x27+27x10; 8x49+8x31-8x50; 15x99+15x13-15x112; 25x13+25x8-25x11;


ma scuzati daca nu se vede bine

Answer 1

5x13-5x3 = 5x(13-3)=5x10=50

19+19x9 = 19x (1+9) = 19x10=190

23x11-23 = 23x(11-1)=23x10=230

7x8+2x7+10x7 = 7x(8+2+7)=7x17=119

41x132-41x32 = 41x(132-32) = 41x100=4100

37x28+42x37-37x15 = 37x(28+42-15)=37x55=2035

27x8+2x27+27x10 = 27x(8+2+10)=27x20=540

8x49+8x31-8x50 = 8x(49+31-50)=8x30=240

15x99+15x13-15x112 = 15x(99+13-112)=15x0=0

25x13+25x8-25x11=25x(13+8-11)=25x10=250