题目内容
计算题
(1)1000-1012÷44
(2)0.45×2+5.6÷0.56
(3)(4
-3
)×(2-
)
(4)
×5+1
÷
(5)(1
-
-0.5×1
)÷
(6)[5
+(3
-1
)÷1.75]×0.25.
(1)1000-1012÷44
(2)0.45×2+5.6÷0.56
(3)(4
| 1 |
| 2 |
| 3 |
| 10 |
| 4 |
| 5 |
(4)
| 7 |
| 15 |
| 4 |
| 9 |
| 13 |
| 27 |
(5)(1
| 1 |
| 22 |
| 1 |
| 8 |
| 3 |
| 4 |
| 10 |
| 11 |
(6)[5
| 1 |
| 42 |
| 5 |
| 8 |
| 5 |
| 12 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)先计算除法,再计算减法.
(2)(4)先算乘除后算加法.
(3)先计算括号内的,再计算乘法.
(5)计算括号内部的(1
-
-0.5×1
)时,先计算乘法,然后运用一个数连续减去两个数,可以用这个数减去这两个数的和.
(6)先计算小括号内部的,再计算中括号内部的,最后计算中括号外面的乘法.
(2)(4)先算乘除后算加法.
(3)先计算括号内的,再计算乘法.
(5)计算括号内部的(1
| 1 |
| 22 |
| 1 |
| 8 |
| 3 |
| 4 |
(6)先计算小括号内部的,再计算中括号内部的,最后计算中括号外面的乘法.
解答:
解:(1)1000-1012÷44
=1000-23
=977
(2)0.45×2+5.6÷0.56
=0.9+10
=10.9
(3)(4
-3
)×(2-
)
=1.2×1.2
=1.44
(4)
×5+1
÷
=
×5+
×
=
+3
=5
(5)(1
-
-0.5×1
)÷
=(
-
-
)×
=[
-(
+
)]×
=
×
=
(6)[5
+(3
-1
)÷1.75]×0.25
=[5
+(3
-1
)÷1.75]×0.25
=[5
+2
×
]×0.25
=[
+
×
]×
=[
+
]×
=
×
=1
=1000-23
=977
(2)0.45×2+5.6÷0.56
=0.9+10
=10.9
(3)(4
| 1 |
| 2 |
| 3 |
| 10 |
| 4 |
| 5 |
=1.2×1.2
=1.44
(4)
| 7 |
| 15 |
| 4 |
| 9 |
| 13 |
| 27 |
=
| 7 |
| 15 |
| 13 |
| 9 |
| 27 |
| 13 |
=
| 7 |
| 3 |
=5
| 1 |
| 3 |
(5)(1
| 1 |
| 22 |
| 1 |
| 8 |
| 3 |
| 4 |
| 10 |
| 11 |
=(
| 23 |
| 22 |
| 1 |
| 8 |
| 7 |
| 8 |
| 11 |
| 10 |
=[
| 23 |
| 22 |
| 1 |
| 8 |
| 7 |
| 8 |
| 11 |
| 10 |
=
| 1 |
| 20 |
| 11 |
| 10 |
=
| 11 |
| 200 |
(6)[5
| 1 |
| 42 |
| 5 |
| 8 |
| 5 |
| 12 |
=[5
| 1 |
| 42 |
| 15 |
| 24 |
| 10 |
| 24 |
=[5
| 1 |
| 42 |
| 5 |
| 24 |
| 4 |
| 7 |
=[
| 211 |
| 42 |
| 53 |
| 24 |
| 4 |
| 7 |
| 1 |
| 4 |
=[
| 211 |
| 42 |
| 53 |
| 42 |
| 1 |
| 4 |
=
| 264 |
| 42 |
| 1 |
| 4 |
=1
| 4 |
| 7 |
点评:此题考查了四则混合运算,注意运算顺序和运算法则.
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