问题 计算题
用简便方法计算。
(1)965+(285-165)(2)370-195-105
(3)243+91+57+109(4)325-114-86
(5)808+449+182+551(6)924-(324-78)
答案

(1)原式=965-165+285

                =800+285

                =1085(2)原式=370-(195+105)

                =370-300

                =70

(3)原式=(243+57)+(91+109)

                =300+200

                =500(4)原式=325-(114+86)

                =325-200

                =125

(5)原式=808+182+(449+551)

                =1000+1000

                =2000(6)原式=924-324+78

                =600+78

                =678

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