题文
口算。
+
= 
-
= +
= 
-
+
=
0.63×1000= 0. 75-0.25= 0.07+0.03= 0. 9÷0.03= 0.4×0.8=
口算。+= -= += - +=
0.63×1000= 0. 75-0.25= 0.07+0.03= 0. 9÷0.03= 0.4×0.8=
试题篮
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