题目内容
| 计算下列各题,能简算的要简算. 96×
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(
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分析:96×
-36÷
+
×40,此题通过变形后,利用乘法分配律的逆运算简算;
÷[(
-
)×2],按运算顺序进行计算,先算小括号内的,再算中括号内的,最后算括号外的;
×25%+
×
,把25%化成分数,用乘法分配律的逆运算简算;
+
+
-
,运用加法交换律和结合律简算;
×
+
÷
,把除法改为乘法后,利用乘法分配律的逆运算简算;
(
-
)-(
-
),先利用减法的性质去括号,然后用加法结合律简算.
| 4 |
| 5 |
| 5 |
| 4 |
| 4 |
| 5 |
| 4 |
| 9 |
| 1 |
| 3 |
| 1 |
| 9 |
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| 4 |
| 3 |
| 4 |
| 7 |
| 9 |
| 1 |
| 4 |
| 4 |
| 9 |
| 2 |
| 7 |
| 5 |
| 9 |
| 2 |
| 7 |
| 9 |
| 4 |
(
| 11 |
| 12 |
| 3 |
| 7 |
| 4 |
| 7 |
| 7 |
| 12 |
解答:解:96×
-36÷
+
×40,
=96×
-36×
+
×40,
=(96-36+40)×
,
=100×
,
=80;
÷[(
-
)×2],
=
÷[(
-
)×2],
=
÷[
×2],
=
÷
,
=1;
×25%+
×
,
=(25%+
)×
,
=(
+
)×
,
=1×
,
=
;
+
+
-
,
=(
+
)+(
-
),
=1+
,
=1
;
×
+
÷
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(
-
)-(
-
),
=
-
-
+
,
=(
+
)-(
+
),
=
-1,
=
.
| 4 |
| 5 |
| 5 |
| 4 |
| 4 |
| 5 |
=96×
| 4 |
| 5 |
| 4 |
| 5 |
| 4 |
| 5 |
=(96-36+40)×
| 4 |
| 5 |
=100×
| 4 |
| 5 |
=80;
| 4 |
| 9 |
| 1 |
| 3 |
| 1 |
| 9 |
=
| 4 |
| 9 |
| 3 |
| 9 |
| 1 |
| 9 |
=
| 4 |
| 9 |
| 2 |
| 9 |
=
| 4 |
| 9 |
| 4 |
| 9 |
=1;
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| 4 |
=(25%+
| 3 |
| 4 |
| 3 |
| 5 |
=(
| 1 |
| 4 |
| 3 |
| 4 |
| 3 |
| 5 |
=1×
| 3 |
| 5 |
=
| 3 |
| 5 |
| 3 |
| 4 |
| 7 |
| 9 |
| 1 |
| 4 |
| 4 |
| 9 |
=(
| 3 |
| 4 |
| 1 |
| 4 |
| 7 |
| 9 |
| 4 |
| 9 |
=1+
| 1 |
| 3 |
=1
| 1 |
| 3 |
| 2 |
| 7 |
| 5 |
| 9 |
| 2 |
| 7 |
| 9 |
| 4 |
=
| 2 |
| 7 |
| 5 |
| 9 |
| 2 |
| 7 |
| 4 |
| 9 |
=(
| 5 |
| 9 |
| 4 |
| 9 |
| 2 |
| 7 |
=1×
| 2 |
| 7 |
=
| 2 |
| 7 |
(
| 11 |
| 12 |
| 3 |
| 7 |
| 4 |
| 7 |
| 7 |
| 12 |
=
| 11 |
| 12 |
| 3 |
| 7 |
| 4 |
| 7 |
| 7 |
| 12 |
=(
| 11 |
| 12 |
| 7 |
| 12 |
| 3 |
| 7 |
| 4 |
| 7 |
=
| 3 |
| 2 |
=
| 1 |
| 2 |
点评:此题考查了学生对四则混合运算顺序的掌握情况,以及运用运算定律灵活简算的能力.
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