(1)635×3574+642.9×66-3÷533(2)498×381+382382×498-116(3)1+316+5112+7120+9130+11142(4)解方程:23X-34=12X-13

题目简介

(1)635×3574+642.9×66-3÷533(2)498×381+382382×498-116(3)1+316+5112+7120+9130+11142(4)解方程:23X-34=12X-13

题目详情

(1)6
3
5
×3574+642.9×66-3÷
5
33

(2)
498×381+382
382×498-116

(3)1+3
1
6
+5
1
12
+7
1
20
+9
1
30
+11
1
42

(4)解方程:
2
3
X-
3
4
=
1
2
X-
1
3
题型:解答题难度:中档来源:不详

答案

解;(1)6class="stub"3
5
×3574+642.9×66-3÷class="stub"5
33

=6.6×3574+6429×6.6-3×6.6,
=6.6×(3574+6429-3),
=6.6×10000,
=66000;

(2)class="stub"498×381+382
382×498-116

=(498×381+382)÷[(381+1)×498-116],
=(498×381+382)÷[381×498+498-116],
=(498×381+382)÷[381×498+(498-116)],
=(498×381+382)÷(381×498+382),
=1;

(3)1+3class="stub"1
6
+5class="stub"1
12
+7class="stub"1
20
+9class="stub"1
30
+11class="stub"1
42

=(1+3+5+7+9+11)+(class="stub"1
6
+class="stub"1
12
+class="stub"1
20
+class="stub"1
30
+class="stub"1
42
),
=36+class="stub"5
14

=36class="stub"5
14


(4)class="stub"2
3
x-class="stub"3
4
=class="stub"1
2
x-class="stub"1
3

class="stub"2
3
x-class="stub"3
4
-class="stub"1
2
x=class="stub"1
2
x-class="stub"1
3
-class="stub"1
2
x,
class="stub"1
6
x-class="stub"3
4
=-class="stub"1
3

class="stub"1
6
x-class="stub"3
4
+class="stub"3
4
=-class="stub"1
3
+class="stub"3
4

class="stub"1
6
x=class="stub"5
12

class="stub"1
6
class="stub"1
6
=class="stub"5
12
÷class="stub"1
6

x=class="stub"5
2

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