题目内容
用你喜欢的方法计算.
9.6-1÷3-
÷
+
÷
0.575×19+1.9×4.25
13÷(
+
)×
.
9.6-1÷3-
| 5 |
| 6 |
| 3 |
| 8 |
| 7 |
| 11 |
| 5 |
| 8 |
| 7 |
| 11 |
0.575×19+1.9×4.25
13÷(
| 1 |
| 4 |
| 5 |
| 6 |
| 3 |
| 4 |
考点:整数、分数、小数、百分数四则混合运算
专题:运算顺序及法则
分析:(1)先算除法,再根据减法的性质简算;
(2)先把除法变成乘法,再运用乘法分配律简算;
(3)运用乘法分配律简算;
(4)先计算小括号里面的加法,再算括号外的除法,最后算乘法.
(2)先把除法变成乘法,再运用乘法分配律简算;
(3)运用乘法分配律简算;
(4)先计算小括号里面的加法,再算括号外的除法,最后算乘法.
解答:
解:(1)9.6-1÷3-
=9.6-
-
=9.6-(
+
)
=9
-
=8
;
(2)
÷
+
÷
=
×
+
×
=(
+
)×
=1×
=
;
(3)0.575×19+1.9×4.25
=5.75×1.9+1.9×4.25
=1.9×(5.75+4.25)
=1.9×10
=19;
(4)13÷(
+
)×
=13÷
×
=12×
=9.
| 5 |
| 6 |
=9.6-
| 1 |
| 3 |
| 5 |
| 6 |
=9.6-(
| 1 |
| 3 |
| 5 |
| 6 |
=9
| 3 |
| 5 |
| 7 |
| 6 |
=8
| 13 |
| 30 |
(2)
| 3 |
| 8 |
| 7 |
| 11 |
| 5 |
| 8 |
| 7 |
| 11 |
=
| 3 |
| 8 |
| 11 |
| 7 |
| 5 |
| 8 |
| 11 |
| 7 |
=(
| 3 |
| 8 |
| 5 |
| 8 |
| 11 |
| 7 |
=1×
| 11 |
| 7 |
=
| 11 |
| 7 |
(3)0.575×19+1.9×4.25
=5.75×1.9+1.9×4.25
=1.9×(5.75+4.25)
=1.9×10
=19;
(4)13÷(
| 1 |
| 4 |
| 5 |
| 6 |
| 3 |
| 4 |
=13÷
| 13 |
| 12 |
| 3 |
| 4 |
=12×
| 3 |
| 4 |
=9.
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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