+=
×=
1-=
+2=
×0=
-=
2.4×0.3= 8.2÷0.01= 4a+a= 12.6-7.6+0.4= 3.6+0.04= 1.1-0.11= 7a×a= 1.25×8÷1.25×8=
①100÷0.2= ②125×0.8= ③ ④
⑤630÷70= ⑥0.75﹣0.7= ⑦0.8+0.2= ⑧9﹣6.3﹣1.7=
+ = - = 0× = × =
12× = + = × = 1- + =