(1+17+19+111)×(17+19+111+121)-(1+17+19+111+121)×(17+19+111).-数学

题目简介

(1+17+19+111)×(17+19+111+121)-(1+17+19+111+121)×(17+19+111).-数学

题目详情

(1+
1
7
+
1
9
+
1
11
)
×(
1
7
+
1
9
+
1
11
+
1
21
)
-(1+
1
7
+
1
9
+
1
11
+
1
21
)
×(
1
7
+
1
9
+
1
11
)
题型:解答题难度:中档来源:不详

答案

(1+class="stub"1
7
+class="stub"1
9
+class="stub"1
11
)
×(class="stub"1
7
+class="stub"1
9
+class="stub"1
11
+class="stub"1
21
)
-(1+class="stub"1
7
+class="stub"1
9
+class="stub"1
11
+class="stub"1
21
)
×(class="stub"1
7
+class="stub"1
9
+class="stub"1
11
)

=[1+(class="stub"1
7
+class="stub"1
9
+class="stub"1
11
)]×(class="stub"1
7
+class="stub"1
9
+class="stub"1
11
+class="stub"1
21
)
-[(1+(class="stub"1
7
+class="stub"1
9
+class="stub"1
11
+class="stub"1
21
)
(class="stub"1
7
+class="stub"1
9
+class="stub"1
11
)

=(class="stub"1
7
+class="stub"1
9
+class="stub"1
11
+class="stub"1
21
)
+(class="stub"1
7
+class="stub"1
9
+class="stub"1
11
)×(class="stub"1
7
+class="stub"1
9
+class="stub"1
11
+class="stub"1
21
)
-(class="stub"1
7
+class="stub"1
9
+class="stub"1
11
)
-(class="stub"1
7
+class="stub"1
9
+class="stub"1
11
+class="stub"1
21
)
×(class="stub"1
7
+class="stub"1
9
+class="stub"1
11
)

(class="stub"1
7
+class="stub"1
9
+class="stub"1
11
+class="stub"1
21
)
-(class="stub"1
7
+class="stub"1
9
+class="stub"1
11
)

=class="stub"1
21

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