5.四则混合运算练习 1.算一算,比一比。 300+180÷5×2 =300+36x2 =300+72 =372 600÷30-10+5 =20-10+5 =10+5 =15 (300+180÷5)×2 =(300+36)x2 =336x2 =672 600÷[30-(10+5)] =600÷(30-15) =600÷15 =40 2.计算。 32×18-540÷45 =576-12 =564 (900-16×35)÷34 =(900-560)÷34 =340÷34 =10 840÷[15×(32-28)] =840÷(15x4) =840÷60 =14 26×[(144+36)÷36] =26x(180÷36) =26x5 =130 |