问题 解答题
100.4-9+0.77÷1.1
简算:(
4
17
+
1
25
)×17×25

解方程
1
2
x-
3
8
=
13
8
答案

(1)100.4-9+0.77÷1.1,

=100.4-9+0.7,

=91.4+0.7,

=92.1;

(2)(

4
17
+
1
25
)×17×25,

=(

4
17
+
1
25
)×(17×25),

=(

4
17
×17×25)+(
1
25
×25×17),

=(4×25)+(1×17),

=100+17,

=117;

(3)

1
2
x-
3
8
=
13
8

1
2
x-
3
8
+
3
8
=
13
8
+
3
8

1
2
x=2,

1
2
x÷
1
2
=2÷
1
2

x=4.

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