4.9×9.950 10.1×57570 4.8﹣ 3.8
11×40=
810÷30=
÷ =
20×498≈
9.8÷0.01=
2.05﹣0.5=
8×25%=
2﹣ =
÷5=
4.58+5.42=
①1.25×2.8﹣31.5÷15
② × ÷ +
① ÷8+ ×
②101×6.9
① x+ x=55
②35:x= :0.2
光明小学位于点(4,4)。