關(guān)于簡(jiǎn)便計(jì)算的奧數(shù)訓(xùn)練題及講解
(1)a+b=b+a
88+56+12
178+350+22
56+208+144
(2)(a+b)+c=a+(b+c)
(23+56)+47
286+54+46+4
582+456+544
(3)a×b=b×a
25×37×475×39×4
65×11×4125×39×16
(4)(a×b)×c=a×(b×c)
19×75×862×8×25
43×15×641×35×2
(5)a×(b+c)=a×b+a×c
136×406+406×64702×123+877×702246×32+34×492
(6)a×(b-c)=a×b-a×c
102×59-59×2456×25-25×5643×126-86×13101×897-897
(7)a-b-c=a-(b+c)
458-45—1552354-456-54468547-457-123-420
(8)a-b+c=a+c-b
4235-4067+763569+526-156945682-7538+14318
(9)a÷b÷c=a÷(b×c)
4500÷4÷7516800÷8÷25248000÷8÷1255200÷4÷65
(10)a÷b×c=a×c÷b
4500×102÷903600÷80×2125÷20×8250÷75×30
(11)a-b=a-(b+c)+c
429-2931587-6898904-129787905-388
(12)a-b=a-(b-c)-c
2564-30225478-90065024-5021251-409
(13)a+b=a+(b+c)-c
254+4895021+897654+793654+4999
(14)a+b=a+(b-c)+c
124+40051235+607248+8032005+45687
(15)綜合
254+246+744+10545897+568-897+43245627-258-742-1627
321×46-92×27-67×4675×32×12565×16×125
360÷(18×4)32×105598+735
99×38+3898×3425+75-25+75
48×125540÷45103×56
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