脱式计算．（1）2970÷（250×12﹣2991）（2）15×1421÷（573﹣566）（3）64×（720+650÷130）（4）118+153÷17×9．
直接写得数+=﹣=×=×=×÷×=+=×0+3= 3+1.75=÷=（+）×=
直接写得数．+0.625= 24×=÷9= （+）×12= 12×25%=÷=
直接写出得数== 3.14×8== 1﹣40%=== 52=
口算．+=×4=÷=×= 15÷=÷8= 0÷=﹣=
直接写得数．﹣=÷12= 15×= 36÷=+=×12=÷=×=××16= 1÷÷=÷2÷=×9÷×9=
+
=
﹣
=
×
=
×
=
×
÷
=
=
×0+3= 3
+1.75=
÷
=（
+
）×
=
+0.625= 24×
=
÷9=
+
）×12= 12×25%=
÷
=
=
= 3.14×8=
=
=
= 52=
+
=
×4=
÷
×
=
=
÷8= 0÷
=
﹣
=
﹣
=
÷12= 15×
= 36÷
=
+
=
÷
=
×
=
×
×16= 1÷
÷
÷2÷
=
×9÷
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