19+9×9=100
118+98×9=1000
1117+987×9=10000
146+250= (148-148) ÷8= 2800÷70= 26÷10÷10=
0.96-0.3= 40-16.5= 6.07+0.4-0.3= 85.7-(15.8-4.8)=
(元)