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А) 6÷2×1=3 см
б)6÷3×1=2см
в)6÷3×2=4 см
(2670+6*(240-43*x)*5)/50+216=336
(2670+6*(240-43*x)*5)/50=336-216
(2670+6*(240-43*x)*5)/50=120
(2670+6*(240-43*x)*5)=120*50
(2670+6*(240-43*x)*5)=6000
2670+6*(1200-215x)=6000
2670+(7200-1290x)=6000
7200-1290x=6000-2670
7200-1290x=3330
1290x=7200-3330
1290x=3870
x=3870/1290
x=3