直接写得数．
1.8×0.3= 42×100= 3.4+1.6= 4×0.25= 
+
=
0.49÷7= 100×0.2= 1﹣0.01= 10÷0.1= 
﹣
=
直接写得数．
1.8×0.3= 42×100= 3.4+1.6= 4×0.25= +=
0.49÷7= 100×0.2= 1﹣0.01= 10÷0.1= ﹣=
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