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简介:
26×103
=26×(100+3)
=26×100+26×3
=2600+78
=2678
202×13
=(200+2)×13
=200×13+2×13
=2600+26
=2626
98+303
=98+3+300
=101+300
=401
501×12
=(500+1)×12
=500×12+1×12
=6000+12
=6012
48×250
=12×4×250
=12×(4×250)
=12×1000
=12000
49+49×49
=49×(1+49)
=49×50
=2450
55×25+25×45
=25×(55+45)
=25×100
=2500
123×67-23×67
=(123-23)×67
=100×67
=6700