题目内容

用竖式计算并验算.
122-nn.9=
2.l8×1.5=
1.44÷18=
n00-00.n=66.n;
n00
-00.n
66.n

验算:
00.n
+66.n
n00.0


0.28×n.5=0.42;
0.2 8
×n.5
n40

28
0.420

验算:
n.5
×0.28
n20

00
0.420


n.44÷n8=0.08;
0.08
n8
n.44

n44
0

验算:
n8
×0.08
n.44
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