,第 4 课时 练习课,第 5 单元 混合运算,练习课,=38,=58,=17,=9,=3,=54,8,15,21,23,22,29,35,37,3,5,7,9,15,25,35,45,3417+3 17+3 20,1833 63 18,=43,=17,=11,=19,=4,=59,9,6,819-3=6,56,88,32+78=88,=25,=54,=20,=60,=7,=4,=21,=29,=5,=20,=13,=13,=13,=13,=42,=42,=82,=8,=8,=26,=9,=53,32,剩余钱数(35-3)=32(元),可买笔袋个数328=4(元),