Question

Scoateti mai intai factorul comun apoi calculati:

20017*2019-2018*2017+2018*2020-201
9*2018;
7*a-7*b daca a-b=30
2*a+10*b daca a +5b=43
10*x+15*y-5*z daca 2x + 3y - z = 39
ax-bx daca a-b=89si x= 756
167*568+568*833



VA ROG!!!!
DAU COROANA!! ​

Answer 1

2017(2019-2018)+2018(2020-2019)=2017+2018=4035

a-b=30

7(a-b)=7*30=210

a+5b=43

2a+10b=2(a+5b)=2*43=86

2x+3y-z=39

10x+15y-5z=5(2x+3y-z)=5*39=195

a-b=89

x=756

ax-bx=x(a-b)=756*89=67284

568(167+833)=560*1000=560000