题目内容

4
5
×3.5+5.5×80%+0.8
(8.8-23.4×
1
3
)÷
5
9
87.8-(7.58-3.8)
13
18
÷(
5
6
+
2
3
×
3
8
)
2
11
×(11+44)+
3
5
÷
1
25
5
8
×0.25+0.375×
1
4
解方程:
1
3
:
1
20
=1
7
9
:x


6x+
1
5
=0.8×1.5.
①
4
5
×3.5+5.5×80%+0.8,
=0.8×3.5+5.5×0.8+0.8,
=0.8×(3.5+5.5+1),
=0.8×10,
=8;

②(8.8-23.4×
1
3
)÷
5
9
,
=(8.8-7.8)×
9
5
,
=
9
5
,
=1
4
5
;

③87.8-(7.58-3.8),
=87.8-3.78,
=84.02;

④
13
18
÷(
5
6
+
2
3
×
3
8
),
=
13
18
÷(
5
6
+
1
4
),
=
13
18
×
12
13
,
=
2
3
;

⑤
12
11
×(11+44)+
3
5
÷
1
25
,
=
12
11
×55+
3
5
×25,
=60+15,
=75;

⑥
5
8
×0.25+0.357×
1
4
,
=(
5
8
+
3
8
)×
1
4
,
=
1
4
;

⑦
1
3
:
1
20
=1
7
9
:x,
1
3
x=
1
20
×
16
9
,
1
3
x=
4
45
,
1
3
x÷
1
3
=
4
45
÷
1
3
,
x=
4
15
;

⑧6x+
1
5
=0.8×1.5,
6x+0.2=1.2,
6x+0.2-0.2=1.2-0.2,
6x=1,
6x÷6=1÷6,
x=
1
6
.
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