27×0.99=120+130+142+156=-数学

题目简介

27×0.99=120+130+142+156=-数学

题目详情

27×0.99=
1
20
+
1
30
+
1
42
+
1
56
=
题型:解答题难度:中档来源:不详

答案

(1)27×0.99
=27×(1-0.01),
=27×1-27×0.01,
=27-0.27,
=26.73;

(2)class="stub"1
20
+class="stub"1
30
+class="stub"1
42
+class="stub"1
56

=class="stub"1
4×5
+class="stub"1
5×6
+class="stub"1
6×7
+class="stub"1
7×8

=class="stub"1
4
-class="stub"1
5
+class="stub"1
5
-class="stub"1
6
+class="stub"1
6
-class="stub"1
7
+class="stub"1
7
-class="stub"1
8

=class="stub"1
4
-class="stub"1
8

=class="stub"1
8

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