+ = + = 2- - = -0.75=
+ = 12.5×8= 0.64÷16=
0.025×100= 0.45÷4.5= 0.25×7×4=
①
②
③0.01÷1=
④52×198≈
⑤
⑥
⑦
⑧23=
+=
-=
1-=
8--=
8×1.25=