有甚麼方法可以快速計算?

例: 10x20x8x50x125x4x9x10x25x8x6x2x100x125
=10x10x20x50x8x125x4x25x9x6x8x125x100
=100x1000x1000x100x54x100000
=54x1,000,000,000,000,000
=54,000,000,000,000,000

這一題用了[乘法交配性質]!!!!!!!!!!!!!!!!!!!!

例: 5000x58%
=(5000x50%) + (5000x8%)
=2500+400
=2900

這一題分拆了58% 這個數!!!!!!!!!!!!!!!!!

例: 1500÷4
= 15(千位和百位)x25(因100÷4=25)
= 375

這一題用了整除性的手法!!!!!!!!!!!!!!!!!!!!

這些只是冰山一角!

例:50000÷2000x2500
= y÷2500x2000=50000
y=25x2500
y=62500

用了方程式來算!!!!!!!!

例:24x2.45
=24x245%
=58.8

用了小數和百分數互化!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

多計數,多思考

你可以多啲計算!咁就係啦!

2007-03-31 18:12:40 補充：
再唔係就請教人囉!

2007-04-02 16:11:08 補充：
又或者去學吓奧數同用計算機都得架!

用計數機!!!!!!