1200÷25
=(1200×4)÷(25×4)
=4800÷100
=48
1055+355-255
=1055+(355-255)
=1055+100
=1155
125×888
=125×8×111
=1000×111
=111000
递等式计算能巧算的巧算1200除以25 1055+355 -255 （125乘888用两在方法计算)怎么做
1200÷25
=(1200×4)÷(25×4)
=4800÷100
=48
1055+355-255
=1055+(355-255)
=1055+100
=1155
125×888
=125×8×111
=1000×111
=111000