脱式计算．÷（50%×÷）； 1﹣[1÷（+）]×；2.87+5.6﹣0.87+4.4； 4.2﹣1.38﹣3.62．
========
直接写出得数．== 1﹣=+0.625=== 3﹣=+0.75=
口算：+= 1.52=﹣= 1.8÷2.7=﹣=+= 4+= 3﹣=﹣=﹣=﹣﹣=++=
（1）+= （2）﹣= ．
直接写出得数．========
÷（50%×
÷
）； 
﹣[1÷（
+
）]×
；
=
=
=
=
=
=
=
=
=
= 1﹣
=
+0.625=
=
= 3﹣
=
+0.75=
+
﹣
= 1.8÷2.7=
﹣
=
+
= 4+
= 3﹣
=
﹣
=
﹣
=
﹣
﹣
=
+
+
=
+
= 
﹣
= ．
=
=
=
=
=
=
=
=
粤公网安备 44130202000953号