用量角器量出图中∠2的度数，再求∠1、∠3和∠4的度数．
直接写得数．=======（﹣）×30=
直接写出得数． 14×=×5=×= 12×= 3×= 7×= 4.8+0.82= 3﹣2.7=（+2）×9=（﹣）×2=
口算题．×=×=×9=××0=+=×11= 5﹣﹣=×9×7=
口算×15=×2=×=×=×= 1×=×=×34=×=×=×=×=×=×=×=×24=×=×30= 28×=×=
直接写出得数×15=×2=×=×= 1×=×=×34=×=×=×=×=×=
=
=
=
=
=
=
=（
﹣
）×30=
=
×5=
×
= 12×
= 3×
=
= 4.8+0.82= 3
﹣2.7=（
+2）×9=（
﹣
）×2=
×
=
×
=
×9=
×
×0=
+
=
×11= 5﹣
﹣
=
×9×7=
×15=
×2=
×
=
×
=
×
=
=
×
=
×34=
×
=
×
=
×
=
×
=
×
=
×
=
×
=
×24=
×
=
×30= 28×
=
×
=
×15=
×2=
×
=
×
=
=
×
=
×34=
×
=
×
=
×
=
×
=
×
=
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