题目内容
混合运算我心细
16×
+
;
×
÷
;
(
-
)×(
+
);
÷5+
×
;
(
+
+
)×(填一个非0数再计算)
16×
| 5 |
| 8 |
| 2 |
| 5 |
| 5 |
| 6 |
| 1 |
| 15 |
| 7 |
| 18 |
(
| 3 |
| 4 |
| 3 |
| 16 |
| 2 |
| 9 |
| 1 |
| 3 |
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 5 |
(
| 3 |
| 8 |
| 1 |
| 6 |
| 5 |
| 12 |
分析:(1)先算乘法,再算加法;
(2)按照从左到右的顺序计算;
(3)先算小括号里面的减法及加法,再算括号外的乘法;
(4)把除法转化为乘法,再利用乘法分配律简算;
(5)乘以各分母的最小公倍数24,利用乘法分配律简算.
(2)按照从左到右的顺序计算;
(3)先算小括号里面的减法及加法,再算括号外的乘法;
(4)把除法转化为乘法,再利用乘法分配律简算;
(5)乘以各分母的最小公倍数24,利用乘法分配律简算.
解答:解:(1)16×
+
=10+
=10
;
(2)
×
÷
=
÷
=
×
=
;
(3)(
-
)×(
+
)
=(
-
)×(
+
)
=
×
=
;
(4)
÷5+
×
=
×
+
×
=(
+
)×
=1×
=
;
(5)(
+
+
)×24
=
×24+
×24+
×24
=9+4+10
=23.
| 5 |
| 8 |
| 2 |
| 5 |
=10+
| 2 |
| 5 |
=10
| 2 |
| 5 |
(2)
| 5 |
| 6 |
| 1 |
| 15 |
| 7 |
| 18 |
=
| 1 |
| 18 |
| 7 |
| 18 |
=
| 1 |
| 18 |
| 18 |
| 7 |
=
| 1 |
| 7 |
(3)(
| 3 |
| 4 |
| 3 |
| 16 |
| 2 |
| 9 |
| 1 |
| 3 |
=(
| 12 |
| 16 |
| 3 |
| 16 |
| 2 |
| 9 |
| 3 |
| 9 |
=
| 9 |
| 16 |
| 5 |
| 9 |
=
| 5 |
| 16 |
(4)
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 5 |
=
| 1 |
| 3 |
| 1 |
| 5 |
| 2 |
| 3 |
| 1 |
| 5 |
=(
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 5 |
=1×
| 1 |
| 5 |
=
| 1 |
| 5 |
(5)(
| 3 |
| 8 |
| 1 |
| 6 |
| 5 |
| 12 |
=
| 3 |
| 8 |
| 1 |
| 6 |
| 5 |
| 12 |
=9+4+10
=23.
点评:此题考查了整数、分数、小数、百分数的四则混合运算,灵活掌握运算定律及运算顺序,是解答此题的关键.
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