1. <1=<3=105
<2=180-105=75
2. <2=130
<3=180-130=50
<1=<3=50
3. х+3х=180
4х=180
х=45
<1=45
<2=45×3=135
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1. <1=<3=105
<2=180-105=75
2. <2=130
<3=180-130=50
<1=<3=50
3. х+3х=180
4х=180
х=45
<1=45
<2=45×3=135