相关试题
= 
+
=
+ =1．
+
=
+
= 
+
=
= 25×4×7= 658+125+75= 40×18×5=直接写出得数
40×25= 848+ =2000 64× =1280 42÷21= 400﹣400÷80=
90﹣ =69 840÷210= 
+
= 
﹣
= 1﹣
=
直接写出得数
40×25= 848+ =2000 64× =1280 42÷21= 400﹣400÷80=
90﹣ =69 840÷210= += ﹣= 1﹣=
+
= 1﹣
= 
﹣
= 68×32≈
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