205×4=
80×90=
20×330=
450÷5=
210×12=
660÷3=
65×20=
15×9=
12×400=
42×400=
101×90=
70÷14=
7.5 -4.3 =
2.18+6.72=
13.5-1.5=
0.47 +6=
9.6 -3.5 =
6.3+3.6=
0.95-0.32 =
2.4+7.3=
27÷3×0= 160+40÷4= 38+5×(12﹣8)=
240﹣30×3= 21﹣0÷21= 0.309×100÷10=
100.240= 12.00= 0.0410=
340×60 34×600 450×1245×102
20 亿19900009999 150×60160×50
408×15408×5×10 60000238006000021800