Question

Dau coroana! X e x
Și punctul • e ori
Plss repede

Answer 1

Răspuns:

$(7x+5)-25+4=54\\\\7x+5=54+25-4\\\\7x=75-5= > x=70:7= > x=10\\\\\\(3x-3):4=13-10\\\\3x-3=3*4\\\\3x=12+3= > x=15:3= > x=5\\\\\\2a-18=510:5\\\\2a-18=102= > 2a=102+18= > a=120:2= > a=60$

Answer 2

Răspuns:

$1.\: (7x+5)-25+4=54\\7x-16=54\\7x=54+16\\7x=70\\x=70:7\\x=10$

$2. \: (3x-3):4+10=13\\3x-3+40=52\\3x+37=52\\3x=52-37\\3x=15\\x=15:5\\x=3$

$3.\: 2a-144:8*5=510\\2a-90==510\\2a=510+90\\2a=600\\a=600:2\\a=300$