算一算．已知∠1=65°，求出：∠2、∠3、∠4的度数．
直接写得数．== 0.9﹣====
直接写出得数． 24×= 72×= 12÷=÷3= 3÷= 0÷= 1﹣÷+=×÷×=
直接写出得数：×= ；×9= ； 6×= ； 0÷= ； 12×= ；×0= ；×= ；÷6= ．
===== 0.8= 1÷= 1﹣﹣=×12=÷=（3+）×0=+=
直接写得数：×=÷=÷3=+=×9×=1﹣÷= 1﹣= 1000×10%×100%=
=
= 0.9﹣
=
=
=
=
= 72×
= 12÷
=
÷3= 3÷
=
= 1﹣
÷
=
×
÷
×
= ；
×9= ； 6×
= ； 0÷
= ；
= ；
×0= ；
×
= ；
÷6= ．
=
=
=
=
= 0.8
= 1÷
= 1﹣
﹣
=
×12=
÷
=（3
+
）×0=
+
=
×
=
÷
=
÷3=
+
=
=1﹣
÷
= 1000×10%×100%=
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