脱式计算．（能简算的要简算）0.125×0.25×8×4 [5﹣1.7÷（2﹣1）]×1 87×÷（+）× 3.9÷1.5﹣2.3×0.5 1÷﹣×．
口算.+=﹣=+﹣= 3+=+= 1﹣﹣=++= 4﹣=
计算：．
= ．
直接写得数． 1﹣+= 1÷×= 0.5﹣+0.5﹣= 8.1+=（+）×24= 7÷×7÷= 9﹣0.9= 72÷0.4= 1.25×8= 0×24+5=
÷（
+
3.9÷1.5﹣2.3×0.5 1
÷
﹣
×
．
+
﹣
=
+
﹣
= 3+
=
+
= 1﹣
﹣
=
+
+
= 4﹣
=
．
= ．
= ．
+
= 1÷
×
= 0.5﹣
+0.5﹣
=（
+
）×24=
×7÷
粤公网安备 44130202000953号