小明用长绳测量一棵大树的树身周长,将绳子对折后绕树一周,绳子还余三

Question

小明用长绳测量一棵大树的树身周长,将绳子对折后绕树一周,绳子还余三米;将绳子三折后绕树一周,绳子还余一米.树身周长是多少米?线长多少米?

Answer 1

小明用长绳测量一棵大树的树身周长,将绳子对折后绕树一周,绳子还余三米;将绳子三折后绕树一周,绳子还余一米.树身周长是多少米?线长多少米?

设周长x米,则绳长2(x+3)米.
2(x+3)=3(x+1),
2x+6=3x+3,
x=3,
2(x+3)=12,
周长3米,绳长12米.

Answer 2

树周长2米，绳长7米。