第2课时 含有小括号的混合运算1、(480-120)÷(120÷4) 1512÷(5×78-384) =360÷30 =1512÷(390-384) =12 =1512÷6 =252 (36+66÷2)×17 =(36+33)×17 =69×17 =11732、80;22;1760; (450-400)x(120-98)=17606;50;300; (24-18)x(350÷7)=3003、75x6+75x4 420+30÷15-5 (32+18)x(60-40)=75×(6+4) =420+2-5 =50x20=75×10 =422-5 =1000=750 =417=417 75x(6+4) (420+30)÷(15-5) 32+18×(60-40)=75×10 =450÷10 |