题目内容
【题目】计算我最细心(能简算的要简算).
902﹣99
278×(728﹣654)
308×57+308×43
360﹣125﹣75
【答案】803 20572 30800 160
【解析】
(1)902﹣99
=902﹣(100﹣1)
=902﹣100+1
=802+1
=803;
(2)278×(728﹣654)
=278×74
=20572;
(3)308×57+308×43
=308×(57+43)
=308×100
=30800;
(4)360﹣125﹣75
=360﹣(125+75)
=360﹣200
=160

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