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简介：
一、运算定律
(1)a+b+c=a+c+b
(2)a+b-c=a-c+b
(3)a-b-c=a-(c+b)
(4)a÷b÷c=a÷c÷b
(5)a×b÷c=a÷c×b
(6)a÷b×c=a×c÷b
(7)a÷b÷c=a÷(b×c)
(8)a÷b×c=a÷(b÷c)
(9)a×(b+c)=a×b+a×c
(10)a×(b-c)=a×b-a×c
二、经典例题
①112+59+38
=112+38+59
=150+59
=219
②125×32
=125×8×4
=1000×4
=4000
③44×25
=11×(4×25)
=11×100
=1100
④360÷12÷5
=360÷(12×5)
=360÷60
=6
⑤350×18
=350×2×9
=700×9
=6300
⑥(25+11)×4
=25×4+11×4
=100+44
=144
⑦(125-9)×6
=125×6-9×6
=150-56
=94
⑧18×35+32×35
=(18+32)×35
=50×35
=1750
⑨540÷45
=540÷9÷5
=60÷5
=12
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