∵√2=1.414
√x=14.14
∴√x=10×√2=√100×√2=√200
x=200
同理:√y=447.2=100×√20=√10000×√20=√200000
y=200000
m=√20000=√2×√10000=100×√2=141.4
∴y÷x-m=200000÷200-141.4=自己算去。。
√20=4.472
√200000=100√20=447.2
√y=447.2
y=200000
√2=1.414
√200=10√2=14.14
x=200
√20000=100√2=141.4=m
y÷x-m
=200000÷200-141.4
=1000-141.4
=858.6
x=200, y=200000, m=141.4 所以y/x-m=200000/200-141.4=858.6