脱式计算①678×758②(229+323)×29×23③1+218+3112+4120+5130+6142+7156+8142+9142④36÷66662.-数学

题目简介

脱式计算①678×758②(229+323)×29×23③1+218+3112+4120+5130+6142+7156+8142+9142④36÷66662.-数学

题目详情

脱式计算
①6
7
8
×7
5
8

②(
2
29
+
3
23
)×29×23
③1+2
1
8
+3
1
12
+4
1
20
+5
1
30
+6
1
42
+7
1
56
+8
1
42
+9
1
42

④36÷66662
题型:解答题难度:中档来源:不详

答案

①6class="stub"7
8
×7class="stub"5
8

=class="stub"55
8
×class="stub"61
8

=class="stub"3355
64


②(class="stub"2
29
+class="stub"3
23
)×29×23,
=(class="stub"2
29
+class="stub"3
23
)×(29×23),
=class="stub"2
29
×(29×23)+class="stub"3
23
×(29×23),
=(class="stub"2
29
×29)×23+class="stub"3
23
×23×29,
=2×23+3×29,
=46+87,
=133;


③1+2class="stub"1
8
+3class="stub"1
12
+4class="stub"1
20
+5class="stub"1
30
+6class="stub"1
42
+7class="stub"1
56
+8class="stub"1
42
+9class="stub"1
42

=1+(2+class="stub"1
8
)+(3+class="stub"1
12
)+(4+class="stub"1
20
)+(5+class="stub"1
30
)+(6+class="stub"1
42
)+(7+class="stub"1
56
)+(8+class="stub"1
42
)+(9+class="stub"1
42
),
=(1+2+3+…+9)+(class="stub"1
8
+class="stub"1
12
+…+class="stub"1
42
),
=45+(class="stub"1
8
+class="stub"1
3
-class="stub"1
4
+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
42
+class="stub"1
42
),
=45+(class="stub"1
42
+class="stub"1
42
),
=45+class="stub"1
21

=45class="stub"1
21


④36÷66662,
=class="stub"36
66662

=class="stub"6
6666
×class="stub"6
6666

=class="stub"1
1111
×class="stub"1
1111

=class="stub"1
12344321

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