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简介:
一次提取
① 76×39+24×39
=(76+24)×39
=100×39
=3900
② 247×19-47×19
=(247-47)×19
=200×19
=3800
多次提取
① 23×46+23×14+77×60
=23×(46+14)+77×60
=23×60+77×60
=(23+77)×60
=100×60
=6000
② 36×19+64×144
=36×19+64×(19+125)
=(36+64)×19+64×125
=1900+8×8×125
=1900+8000
=9900