(1)40+50+60+70+80=60×_. (2)120+130+140+150+160=_×_. (3)395-25-75=_-(25+75) (4)800÷25÷4=_÷(25×4)

问题描述:

(1)40+50+60+70+80=60×______.
(2)120+130+140+150+160=______×______.
(3)395-25-75=______-(25+75)
(4)800÷25÷4=______÷(25×4)

(1)40+50+60+70+80=60×5;
(2)120+130+140+150+160=140×5;
(3)395-25-75=395-(25+75);
(4)800÷25÷4=800÷(25×4).
故答案为:5,140,5,395,800.