过黑点给已知的直线上画一条垂线和一条平行线，并标出垂足．
根据算式涂一涂．×；×．
80个米相加是多少米？
直接写出得数．×=×=×=×= 5×=×21=×=×=×=×=
直接写出得数． 8π= 1.4﹣= 1﹣﹣﹣= 0.33+0.77= 10××= 18.84÷3.14=（+）×6=
口算．+= 99×=×= 6﹣﹣=××=×75=×=×=×=×（1﹣）=
×
；
×
．
米相加是多少米？
×
=
×
×
=
×
= 5×
=
×21=
×
=
×
=
×
=
×
=
= 1﹣
﹣
﹣
= 0.33+0.77=
×
= 18.84÷3.14=（
+
）×6=
+
=
=
×
=
﹣
=
×
×
=
×75=
×
=
×
=
×
=
×（1﹣
）=
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