(列简便运算(综合算式))求答案!记住!要简便!

问题描述:

(列简便运算(综合算式))求答案!记住!要简便!
综合算式:
(1)328.4-18.4×3.2
(2)17.64×114-14
(3)392.8+47.2-192.8
(4)34.2÷4÷25
19:00要交!

328.4-18.4×3.2
=328.4-18 2/5×3 1/5
=328.4-294.4
=34
17.64×114-14
=17.64×(100+14)-14
=1976.96
392.8+47.2-192.8
=(392.8+47.2)-192.8
=440-192.8
=247.2
34.2÷4÷25
=34.2÷(4×25)
=34.2÷100
=0.342第一题写错了。。。328.4-18.4×3.2=328.4-18 2/5×3 1/5=328.4-58.88=269.52