口算．2×3×7= 63÷（3×3）= 54÷6= 16+4﹣15=72﹣12﹣30= 5×4+4= 6×6﹣6= 60+7+30=2×5+49= 91﹣14﹣36=
直接写得数．×0×17=÷4÷=÷= 57×=﹣+=××= 1÷=（6+）×=﹣=+=
4÷=×6÷= 6×+6×=×= （+）×16= 1÷=×= 24%×5=
口算： （1）÷= 4﹣= 0÷（1+）= （2）﹣= 1.75+=××12= （3）2×=÷= 2×（+）=×÷×=
直接写出得数．=== 6.3×10%== 7×== 40%﹣0.25=
直接写出得数． 1÷=+÷4=×÷×= 3÷﹣÷3=÷0.8%= 0.705+3.35= 1.5×（﹣）= 0.375×0.375=
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×0×17=
÷4÷
÷
= 57×
=
﹣
+
=
×
×
= 1÷
=（6+
）×
=
﹣
=
+
=
=
×6÷
+6×
=
×
=
+
）×16= 1÷
=
×
= 24%×5=
÷
= 4﹣
= 0÷（1+
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= 1.75+
=
×
×12=
=
÷
= 2×（
+
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×
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= 6.3×10%=
= 7×
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= 40%﹣0.25=
=
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×
= 3÷
﹣
÷0.8%= 0.705+3.35= 1.5×（
）= 0.375×0.375=