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简介:
① 拆成a×(100+1)
84×101
=84×(100+1)
=84×100+84×1
=8400+84
=8484
② 拆成a×(100-1)
99×64
=(100-1)×64
=100×64-1×64
=6400-64
=6336
③ a×(b+c)=a×b+a×c
99×13+13
=99×13+13×1
=13×(99+1)
=13×100
=1300
④ (a×b)×c=a×(b×c)
125×32×8
=125×8×32
=1000×32
=32000
⑤a÷b÷c=a÷(b×c)
3600÷25÷4
=3600÷(25×4)
=3600÷100
=36
⑥ (a+b)+c=a+(b+c)
278+463+22+37
=(278+22)+(463+37)
=300+500
=800
⑦ a-b-c=a-(b+c)
214-(85+14)
=214-14-85
=200-85
=115
⑧ (a-b)×c=a×c-b×c
178×101-178
=178×(101-1)
=178×100
=17800