有數學唔識做？？

(1)
1km=1000m
0.42km=(0.42x1000)m
0.42km=420m
(2)
1m(2次方)=100cm(2次方)
0.064m(2次方)=(0.064x100)cm(2次方)
0.064m(2次方)=6.4cm(2次方)
(3)
10mm(2次方)=1cm(2次方)
860000mm(2次方)=860000/10 cm(2次方)
860000mm(2次方)=86000cm(2次方)
(4)
1000m(2次方)=1km(2次方)
427000m(2次方)=427000/1000 km(2次方)
427000m(2次方)=427km(2次方)
註: / =除號

其實只要你知道單位換算,再代入你條式就可以計到出來
10mm=1cm
100cm=1m
1000m=1km

1. 1km=1000m
0.42km=(0.42x1000)m=420m

2. 1m(2次方)=100x100cm(2次方)
0.64m(2次方)=6400cm(2次方)

3. 10x10mm(2次方)=1cm(2次方)
860000mm(2次方)=8600cm(2次方)

4. 1000x1000m(2次方)=1km(2次方)
427000m(2次方)=0.427km(2次方)

0.42km=_420_m
0.42*1000=420


0.064m(2次方)=_0.00064_cm(2次方)
0.064/100 = 0.00064


860000mm(2次方)=_8600_cm(2次方)
860000/100=8600


427000m(2次方)=__427__km(2次方)
427000/1000 = 427

2007-01-20 17:45:17 補充：
860000mm(2次方)=_86,000_cm(2次方)860000/10 = 86000 ←除10才對10mm=1cm

2007-01-21 22:47:10 補充：
1km = 1,000m = 100,000cm = 1,000,000mm1m = 0.001km = 100cm = 10,00 mm 1cm = 0.00001km = 0.001m = 10mm1mm = 0.000001km = 0.001m = 0.1cm

0.42km=420m
0.064m(2次方)=6.4cm(2次方)
860000mm(2次方)=86000cm(2次方)
427000m(2次方)=427km(2次方)