Răspuns:
a)x+30+x=180
2x=180-30
2x=150x=150/2=75
b)x-42+x=180
2x=180+42
2x=222
x=222:2=111
c)x+3x/5=180
(5x+3x)/5=180
8x=180*5
8x=900
x=900/8=225/2
x=112 grade si 30 minute
d)x+x+24=90
2x=90-24
2x=66x=66/2=33
x+x-3=90
2x=90+3
2x=93
x=93:2=46grade si 30 minute
Explicație pas cu pas:
