（云阳县）过O点分别作线段AB的垂线和平行线．
口算，直接写出得数．64﹣46= 1.72+2.38= 0.25×40= 2.4÷0.6= == 12= 8×12.5%= = 0.52=
直接写出得数25+75= 8﹣5.3= 4.65×100= ×4÷×4=×2= 10÷= 350÷50= +﹣×=
2×0.3=÷12=315﹣198=÷=
直接写得数．76+23= 0.4×0.2= 0.32+3.2= +=25÷0.5= 12÷= ×= 43÷10%=
直接写出得数．105﹣38= ÷= 1500÷50= 2.5×0.4=24×（﹣）= 65×10%= 0.125×3×8= 8﹣=1÷= 1﹣﹣=
=
= 12
= 8×12.5%= 
= 0.52=
×4÷
×2= 10÷
= 350÷50= 
+
×
=
÷12=
÷
=
+
=
= 
×
= 43÷10%=
÷
= 1500÷50= 2.5×0.4=
﹣
）= 65×10%= 0.125×3×8= 8
﹣
= 1
﹣
﹣
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