量出∠1的度数并标明．
直接写出得数．+=﹣=﹣= 1﹣=﹣=+=
计算下列各题，能简算的要简算．．
直接写得数．+= 43×200= 1﹣= 350+50= 630÷7= 15×6÷9=+= 45﹣9×5=
直接写出得数﹣=﹣=+=+= 1﹣﹣=+=﹣=+=
直接写得数．﹣=+=+= 1﹣﹣=﹣=+= 1﹣=﹣+=
+
=
﹣
=
﹣
= 1﹣
=
﹣
=
+
=
．
+
= 43×200= 1﹣
= 350+50=
+
= 45﹣9×5=
﹣
=
﹣
=
+
=
+
﹣
=
=
﹣
=
+
=
﹣
=
+
=
+
= 1﹣
﹣
=
﹣
=
+
= 1﹣
=
﹣
+
=
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