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简介:
1)67+42+33+58
=(67+33)+(42+58)
=100+100
=200
(2)26×103
=26×(100+3)
=26×100+26×3
=2600+78
=2678
(3)258-58-26-74
=(258-58)-(26+74)
=200-100
=100
(4)125×16
=125×(10+6)
=125×10+125×6
=1250+750
=2000
(5)501×12
=(500+1)×12
=500×12+1×12
=6000+12
=6012
(6)25×(40+8)
=25×40+25×8
=1000+200
=1200
(7)50×(2×4)×25
=(50×2)×(25×4)
=100×100
=10000
(8)55×25+25×45
=(55+45)×25
=100×25
=2500