四年级数学【简便计算·提公因式法】例题解析

四年级数学【简便计算·提公因式法】例题解析


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