新华书店:购一套按定价的80%;图书大厦:买3本赠1本
7.63﹣0.54+1.37﹣2.46
1.25×2.5×32
11.2× +7.8× +
□○□=□(元)
345﹣298= 0.64÷0.8= ﹣ = × =
1÷0.05= 0.25×40= 2÷ = ×25%=
500-213= 10÷10%= 0.25+2.83= 1.25×0.8= 3.7-3.7÷3.7=
92-33= + = × = 9÷ = ( - )×20=