5.
<1=110°
<2=180°-110°=70°
<3=<1=110°
9.
2х+3х+4х=81
9х=81
х=81:9=9
2х=2*9=18
3х=3*9=27
4х=4*9=36
10.
<1=<3=<5=<7=75°
<2=<4=<6=<8=180°-75°=105°
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5.
<1=110°
<2=180°-110°=70°
<3=<1=110°
9.
2х+3х+4х=81
9х=81
х=81:9=9
2х=2*9=18
3х=3*9=27
4х=4*9=36
10.
<1=<3=<5=<7=75°
<2=<4=<6=<8=180°-75°=105°