有Ｄ數學５識計ａｒ！！！！(2)

(1)
23.4/5.2 x 4.4
= 4.5 x 4.4
= 19.8
(2)
多送200ml /橙汁一瓶８００ml x 100%
= 200/800 x 100%
= 25%

23.4/5.2x4.4
=4.5x4.4
=19,.8

200/800x100%
=1/4x100%
=25%

1. 23.4 / 5.2 x 4.4
=(23.4 / 5.2 )*10x 4.4
=234/52*4.4
=4.5*4.4
=19.8

2.橙汁一瓶原有８００ml，現多送200ml。多送的佔全瓶的百分之幾？（列式計算）
多送的佔全瓶的:
=200ml/(800ml+200ml)*100%
=200ml/1000ml*100%
=20%

1. 23.4 /(5.2X4.4)
=23.4/22.8
=1.2631579

2.
=25%

1. 23.4 / 5.2 x 4.4
=(234/100)/(52/10)x(44/10)
=(234x52)/1000x(22/5)
=(12168/1000)X(22/5)
=(9/2)(22/5)
=(9)(11/5)
=99/5

2.現在全瓶有1000ml
多送的佔:
(200/1000)x100%
=0.2x100%
=20%

1. 23.4 / 5.2 x 4.4
=4.5x4.4
=19.8

2. [200/(800+200)]x100%
=0.2x100%
=20%