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用加法运算定律计算下面各题。
(1)65+240+235 (2)123+58+77
(3)444+85+56 (4)51+(49+76)
(5)44+85+156 (6)27+37+173
(7)754+184+16+46
(1)原式=(65+235)+240
                =300+240
                =540
(2)原式=(123+77)+58
                =200+58
                =258
(3)原式=(444+56)+85
                =500+85
                =585
(4)原式=(51+49)+76
                =100+76
                =176
(5)原式=(44+156)+85
                =200+85
                =285
(6)原式=(27+173)+37
                =200+37
                =237
(7)原式=(754+46)+(184+16)
               =800+200
               =1000
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