题目内容
简便运算
(1)
+(
+
)×
; (2)
÷[
-(
+
)];
(3)36
÷4; (4)55×(
+
);
(5)8.5×
+8
×0.75+8.5; (6)3×(
+
)-
;
(7)
×
+0.75+
×75%; (8)
×
+
÷
+
÷
;
(9)(1-75%)÷(1+
); (10)
×8+
×8+
+
+
.
(1)
| 2 |
| 3 |
| 4 |
| 7 |
| 1 |
| 2 |
| 7 |
| 25 |
| 5 |
| 12 |
| 5 |
| 6 |
| 3 |
| 8 |
| 1 |
| 4 |
(3)36
| 4 |
| 7 |
| 7 |
| 44 |
| 7 |
| 22 |
(5)8.5×
| 1 |
| 4 |
| 1 |
| 2 |
| 2 |
| 15 |
| 1 |
| 12 |
| 2 |
| 5 |
(7)
| 2 |
| 9 |
| 3 |
| 4 |
| 7 |
| 9 |
| 6 |
| 7 |
| 4 |
| 15 |
| 3 |
| 7 |
| 15 |
| 4 |
| 4 |
| 15 |
| 7 |
| 12 |
(9)(1-75%)÷(1+
| 1 |
| 4 |
| 19 |
| 25 |
| 6 |
| 25 |
| 2 |
| 25 |
| 2 |
| 25 |
| 2 |
| 25 |
考点:整数、分数、小数、百分数四则混合运算,运算定律与简便运算
专题:运算顺序及法则,运算定律及简算
分析:(1)首先计算小括号里面的,然后计算乘法,最后计算加法即可;
(2)首先计算小括号里面的,然后计算中括号里面的,最后计算中括号外面的即可;
(3)根据除法的性质简算即可;
(4)(5)(6)(7)(8)(10)根据乘法分配律简算即可;
(9)首先计算小括号里面的,然后计算除法即可.
(2)首先计算小括号里面的,然后计算中括号里面的,最后计算中括号外面的即可;
(3)根据除法的性质简算即可;
(4)(5)(6)(7)(8)(10)根据乘法分配律简算即可;
(9)首先计算小括号里面的,然后计算除法即可.
解答:
解:(1)
+(
+
)×
=
+
×
=
+
=
(2)
÷[
-(
+
)]
=
÷[
-
]
=
÷
=2
(3)36
÷4
=(36+
)÷4
=36÷4+
÷4
=9+
=9
(4)55×(
+
)
=55×
+55×
=26.25
(5)8.5×
+8
×0.75+8.5
=8.5×(
+0.75+1)
=8.5×2
=17
(6)3×(
+
)-
=3×
+3×
-
=
+
-
=
-
+
=
(7)
×
+0.75+
×75%
=
×0.75+0.75+
×0.75
=(
+1+
)×0.75
=2×0.75
=1.5
(8)
×
+
÷
+
÷
=
×
+
×
+
×
=(
+
+
)×
=3×
=
(9)(1-75%)÷(1+
)
=0.25÷1.25
=0.2
(10)
×8+
×8+
+
+
=(
+
)×8+
×3
=8+
=8
| 2 |
| 3 |
| 4 |
| 7 |
| 1 |
| 2 |
| 7 |
| 25 |
=
| 2 |
| 3 |
| 15 |
| 14 |
| 7 |
| 25 |
=
| 2 |
| 3 |
| 3 |
| 10 |
=
| 29 |
| 30 |
(2)
| 5 |
| 12 |
| 5 |
| 6 |
| 3 |
| 8 |
| 1 |
| 4 |
=
| 5 |
| 12 |
| 5 |
| 6 |
| 15 |
| 24 |
=
| 5 |
| 12 |
| 5 |
| 24 |
=2
(3)36
| 4 |
| 7 |
=(36+
| 4 |
| 7 |
=36÷4+
| 4 |
| 7 |
=9+
| 1 |
| 7 |
=9
| 1 |
| 7 |
(4)55×(
| 7 |
| 44 |
| 7 |
| 22 |
=55×
| 7 |
| 44 |
| 7 |
| 22 |
=26.25
(5)8.5×
| 1 |
| 4 |
| 1 |
| 2 |
=8.5×(
| 1 |
| 4 |
=8.5×2
=17
(6)3×(
| 2 |
| 15 |
| 1 |
| 12 |
| 2 |
| 5 |
=3×
| 2 |
| 15 |
| 1 |
| 12 |
| 2 |
| 5 |
=
| 2 |
| 5 |
| 1 |
| 4 |
| 2 |
| 5 |
=
| 2 |
| 5 |
| 2 |
| 5 |
| 1 |
| 4 |
=
| 1 |
| 4 |
(7)
| 2 |
| 9 |
| 3 |
| 4 |
| 7 |
| 9 |
=
| 2 |
| 9 |
| 7 |
| 9 |
=(
| 2 |
| 9 |
| 7 |
| 9 |
=2×0.75
=1.5
(8)
| 6 |
| 7 |
| 4 |
| 15 |
| 3 |
| 7 |
| 15 |
| 4 |
| 4 |
| 15 |
| 7 |
| 12 |
=
| 6 |
| 7 |
| 4 |
| 15 |
| 3 |
| 7 |
| 4 |
| 15 |
| 4 |
| 15 |
| 12 |
| 7 |
=(
| 6 |
| 7 |
| 3 |
| 7 |
| 12 |
| 7 |
| 4 |
| 15 |
=3×
| 4 |
| 15 |
=
| 4 |
| 5 |
(9)(1-75%)÷(1+
| 1 |
| 4 |
=0.25÷1.25
=0.2
(10)
| 19 |
| 25 |
| 6 |
| 25 |
| 2 |
| 25 |
| 2 |
| 25 |
| 2 |
| 25 |
=(
| 19 |
| 25 |
| 6 |
| 25 |
| 2 |
| 25 |
=8+
| 6 |
| 25 |
=8
| 6 |
| 25 |
点评:此题主要考查了整数、分数、小数四则混合运算,注意运算顺序,注意乘法运算定律的应用.
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