如题所述
25×44
=25×40+25×4
=1000+100
=1100,
104×12
=100×12+4×12
=1200+48
=1248.
68×99
=68×(100-1)
=6800-68
=6732.
=25×40+25×4
=1000+100
=1100,
104×12
=100×12+4×12
=1200+48
=1248.
68×99
=68×(100-1)
=6800-68
=6732.
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第1个回答 2017-04-30
=25*4*11
=100*11
=1100
=100*12+4*12
=1200+48
=1248
= 68*（100-10
=68*100-68
=6800-68
=6732
=100*11
=1100
=100*12+4*12
=1200+48
=1248
= 68*（100-10
=68*100-68
=6800-68
=6732
