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简介:
第一种
(300+6)x12 25x(4+8)
=300x12+6x12 =25x4+25x8
=3600+72 =100+200
=3672 =300
第二种
84x101 504x25
=84x(100+1) =(500+4)x25
=84x100+84x1 =500x25+25x4
=8400+84 =12500+100
=8484 =12600
第三种
99x64 99x16
=(100-1)x64 =(100-1)x16
=100x64-64x1 =16x100-16x1
=6400-64 =1600-16
=6336 =1584