1800﹣799=
560÷8×7=
6.4+9.6﹣12=
8×125%=
×25=
40× =
1﹣3÷7=
÷ =
0.3×0.3÷0.3×0.3=
（1﹣ ）×16=
×24÷ =
× × =
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