题目内容
(1)(
+
)÷
+
=
(2)若
x=52×50%+
x,则x=
2 |
5 |
5 |
8 |
3 |
5 |
2 |
3 |
2
3 |
8 |
2
;3 |
8 |
(2)若
1 |
2 |
8 |
15 |
-780
-780
.分析:(1)(
+
)÷
+
,根据分数四则混合运算的顺序,按照分数四则运算的计算法则脱式计算;
(2)若
x=52×50%+
x,顺序把百分数化成小数,再利用等式的性质求解即可.
2 |
5 |
5 |
8 |
3 |
5 |
2 |
3 |
(2)若
1 |
2 |
8 |
15 |
解答:解:(1)(
+
)÷
+
,
=
÷
+
,
=
×
+
,
=
+
,
=
,
=2
;
(2)若
x=52×50%+
x,
x=52×0.5+
x,
x-
x=26,
-
x=26,
-
x×30=26×30,
x=-780;
故答案为:2
,-780.
2 |
5 |
5 |
8 |
3 |
5 |
2 |
3 |
=
41 |
40 |
3 |
5 |
2 |
3 |
=
41 |
40 |
5 |
3 |
2 |
3 |
=
41 |
24 |
16 |
24 |
=
57 |
24 |
=2
3 |
8 |
(2)若
1 |
2 |
8 |
15 |
1 |
2 |
8 |
15 |
1 |
2 |
8 |
15 |
-
1 |
30 |
-
1 |
30 |
x=-780;
故答案为:2
3 |
8 |
点评:此题考查的目的是掌握分数四则混合运算的顺序及它们的计算法则,理解掌握等式的性质及解方程的方法步骤.
练习册系列答案
相关题目