解方程.78x=2140x÷35=2389x÷13=215.-数学

题目简介

解方程.78x=2140x÷35=2389x÷13=215.-数学

题目详情

解方程.
7
8
x=
21
40
3
5
=
2
3
8
9
1
3
=
2
15
题型:解答题难度:中档来源:不详

答案

(1)class="stub"7
8
x=class="stub"21
40

     class="stub"7
8
class="stub"8
7
=class="stub"21
40
×class="stub"8
7

           x=class="stub"3
5


(2)x÷class="stub"3
5
=class="stub"2
3

 x÷class="stub"3
5
×class="stub"3
5
=class="stub"2
3
×class="stub"3
5

         x=class="stub"2
5


(3)class="stub"8
9
class="stub"1
3
=class="stub"2
15

 class="stub"8
9
class="stub"1
3
×class="stub"1
3
=class="stub"2
15
×class="stub"1
3

         class="stub"8
9
x=class="stub"2
45

     class="stub"8
9
class="stub"9
8
=class="stub"2
45
×class="stub"9
8

           x=class="stub"1
20

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