①写作: 100203000
②写作: 240000100
③写作:
×30<100 59×<502
54 99 330 91
500-213= 10÷10%= 0.25+2.83= 1.25×0.8= 3.7-3.7÷3.7=
92-33= + = × = 9÷ = ( - )×20=