题目内容
计算
(1)
-(0.375×45+1÷3.75÷1.6)÷0.4
(2)(7
-6
)÷[2
+(4-2
)÷1.35].
(1)
| 5 |
| 6 |
(2)(7
| 5 |
| 18 |
| 5 |
| 11 |
| 14 |
| 15 |
| 14 |
| 25 |
分析:根据四则混合运算:先算乘除后算加减,有括号的先算括号里的运算顺序计算即可.
解答:解:(1)
-(0.375×45+1÷3.75÷1.6)÷0.4,
=
-(16
+
)÷0.4,
=
-(16
+
)÷0.4,
=
-19
÷
,
=
-
,
=-
;
(2)(7
-6
)÷[2
+(4-2
)÷1.35],
=
÷[2
+1
÷1.35],
=
÷[2
+
],
=
÷4,
=
.
| 5 |
| 6 |
=
| 5 |
| 6 |
| 7 |
| 8 |
| 1 |
| 6 |
=
| 5 |
| 6 |
| 7 |
| 8 |
| 1 |
| 6 |
=
| 5 |
| 6 |
| 1 |
| 24 |
| 2 |
| 5 |
=
| 5 |
| 6 |
| 2285 |
| 48 |
=-
| 2245 |
| 48 |
(2)(7
| 5 |
| 18 |
| 5 |
| 11 |
| 14 |
| 15 |
| 14 |
| 25 |
=
| 163 |
| 198 |
| 14 |
| 15 |
| 11 |
| 25 |
=
| 163 |
| 198 |
| 14 |
| 15 |
| 16 |
| 15 |
=
| 163 |
| 198 |
=
| 163 |
| 792 |
点评:本题的计算量比较大所以计算要细心,注意运算顺序和运算法则.
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