已知∠1=60°，求∠2、∠3和∠4的度数．
﹣0.01= 2+= 27÷9=（﹣）×12= 0.39÷2= 2+5.75= 1÷1= 7﹣7÷9=×1.8= 0.6÷= 2.1÷0.35= 1÷1+0.15=
直接写得数：+= 7÷1.4=÷7=÷2÷= 0.8×0.5÷= 0.25×25%= 4×÷4×= 4﹣﹣=
直接写出得数 296﹣28=+=﹣= 12×=÷3= 35+55= 20÷=×= 0×=×÷×=
直接写得数=====
直接写出得数． 17×=+=×52= 1÷= 3﹣=÷3= 0.32= 20×5.5=
﹣0.01= 2
+
= 27
÷9=（
﹣
）×12= 0.39÷2
= 2
+5.75=
÷1
= 7﹣7÷9=
×1.8= 0.6÷
= 2.1÷0.35= 1
÷1+0.15=﹣0.01= 2+= 27÷9=（﹣）×12= 0.39÷2= 2+5.75=÷1= 7﹣7÷9=×1.8= 0.6÷= 2.1÷0.35= 1÷1+0.15=
+
= 7÷1.4=
÷7=
÷2÷
= 0.25×25%= 4×
÷4×
﹣
=
+
=
﹣
= 12×
=
÷3=
=
×
= 0×
=
×
÷
=
=
=
=
=
=
+
=
×52= 1÷
=
=
÷3= 0.32= 20×5.5=
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