口算。
0.4×0.02= 3.5＋7.6= 1.23÷3= 2.4×2.5= 16÷1.6= 0.9÷0.01= 7÷0.25= 99×0.25= 12×0.4＋0.4×13= 4×(1.5＋0.25)=
口算。
0.4×0.02= 3.5＋7.6= 1.23÷3= 2.4×2.5= 16÷1.6= 0.9÷0.01= 7÷0.25= 99×0.25= 12×0.4＋0.4×13= 4×(1.5＋0.25)=
）÷（
×1.8）-0.75÷
-
=
÷
= 499
÷5=
÷
×
= 2÷
×16-2÷
=
×1
=
。
=16：
2.4（
+
+
+
+
）×8
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