1-0.74= = 0.01÷0.4= 8÷1.5÷2=
0.23= 7÷7%= = =
523﹣23×7
4.97+6.38+5.03﹣4.38
60×()
×3.2+5.6×0.5+1.2×50%
()÷
10÷=5(盒)
10÷=2(个)