先想好运算顺序，再认真计算．145÷5×6==68+79﹣38==13×36÷12==235﹣72+29==
直接写出得数．+0.2=+﹣0.2= 5÷=×1.5+3= 3.6×=×1.5=﹣= 1﹣137.5%=
直接写得数﹣=÷9= 1﹣=×=÷=÷=+=×=+=÷=﹣=×=
直接写出得数．+=﹣=×2=×=×=÷4=÷= 12×=÷42=×=×14=÷4=
口算 78﹣0.8= 18×40= 910÷70= 1÷=﹣= 3﹣= 3.48+6.52=×=÷= 0.8﹣=
直接写得数． 2/5﹣1/10= 16÷2/7= 1/2÷3/5= 1/7×1/7= 1/4×2/5= 5/6﹣1/2= 2/7×0+9= 3/5×1/21= 2/7×21= 14/17÷7= 1÷5﹣1/5= 4/7+4/7×6=（1/8+4/8）×4/5= 6×5÷1/2= 1/9÷1/3= 5/9×1/5÷5/9×1/5=
+0.2=
+
﹣0.2= 5÷
=
×1.5+3=
=
×1.5=
﹣
= 1﹣137.5%=
﹣
=
÷9= 1﹣
=
×
=
÷
=
÷
=
+
=
=
+
=
÷
=
﹣
=
×
=
+
=
﹣
=
×2=
×
=
×
=
÷4=
÷
= 12×
=
÷42=
×
=
×14=
÷4=
=
﹣
=
= 3.48+6.52=
×
=
÷
= 0.8﹣
=
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