394+8×7， 693﹣（271+169） 400﹣256﹣78， （416﹣360）÷7．
口算.+=﹣=+﹣= 3+=+= 1﹣﹣=++= 4﹣=
计算：．
= ．
直接写得数． 1﹣+= 1÷×= 0.5﹣+0.5﹣= 8.1+=（+）×24= 7÷×7÷= 9﹣0.9= 72÷0.4= 1.25×8= 0×24+5=
+
﹣
=
+
﹣
= 3+
=
+
= 1﹣
﹣
=
+
+
= 4﹣
=
．
= ．
= ．
+
= 1÷
×
= 0.5﹣
+0.5﹣
=（
+
）×24=
×7÷
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