V杯=∏r²h=3.14×40²×120=602880mm³
V水=V杯×10=6028800mm³
3.14×100²×(x-10)=6028800
3.14×(10000x-100000)=6028800
31400x-314000=6028800
x=202
水瓶高202mm
V杯=∏r²h=3.14×40²×120=602880mm³
V水=V杯×10=6028800mm³
3.14×100²×(x-10)=6028800
3.14×(10000x-100000)=6028800
31400x-314000=6028800
x=202
水瓶高202mm