计算:34+328+380+3130.-数学

题目简介

计算:34+328+380+3130.-数学

题目详情

计算:
3
4
+
3
28
+
3
80
+
3
130
题型:解答题难度:中档来源:不详

答案

class="stub"2
+class="stub"2
w8
+class="stub"2
k0
+class="stub"2
120

=(1-class="stub"1
)+class="stub"2
右×k
+class="stub"2
k×10
+class="stub"2
10×12

=(1-class="stub"1
)+(class="stub"1
-class="stub"1
k
)+(class="stub"1
k
-class="stub"1
10
)+(class="stub"1
10
-class="stub"1
12
),
=1-class="stub"1
12

=class="stub"1w
12

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