题目内容
计算下面各题,能简算的要简算.
3.5×50+3.5×50;
÷[
×(
-
)]; 24×(
+
+
);
×25%+
×
.
3.5×50+3.5×50;
| 4 |
| 7 |
| 1 |
| 3 |
| 3 |
| 5 |
| 1 |
| 6 |
| 3 |
| 8 |
| 1 |
| 6 |
| 2 |
| 3 |
| 4 |
| 15 |
| 11 |
| 15 |
| 1 |
| 4 |
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,小数四则混合运算
专题:运算顺序及法则,运算定律及简算
分析:①根据乘法分配律简便计算;
②根据四则混合运算的顺序进行计算;
③根据乘法分配律简便计算;
④根据乘法分配律简便计算.
②根据四则混合运算的顺序进行计算;
③根据乘法分配律简便计算;
④根据乘法分配律简便计算.
解答:
解:①3.5×50+3.5×50
=(1+1)×3.5×50
=2×3.5×50
=7×50
=350
②
÷[
×(
-
)]
=
÷[
×(
-
)]
=
÷(
×
)
=
÷
=
×
=3
③24×(
+
+
)
=24×
+24×
+24×
=9+4+16
=29
④)
×25%+
×
=
×
+
×
=
×(
+
)
=
×1
=
=(1+1)×3.5×50
=2×3.5×50
=7×50
=350
②
| 4 |
| 7 |
| 1 |
| 3 |
| 3 |
| 5 |
| 1 |
| 6 |
=
| 4 |
| 7 |
| 1 |
| 3 |
| 18 |
| 30 |
| 5 |
| 30 |
=
| 4 |
| 7 |
| 1 |
| 3 |
| 13 |
| 30 |
=
| 4 |
| 7 |
| 13 |
| 90 |
=
| 4 |
| 7 |
| 90 |
| 13 |
=3
| 87 |
| 91 |
③24×(
| 3 |
| 8 |
| 1 |
| 6 |
| 2 |
| 3 |
=24×
| 3 |
| 8 |
| 1 |
| 6 |
| 2 |
| 3 |
=9+4+16
=29
④)
| 4 |
| 15 |
| 11 |
| 15 |
| 1 |
| 4 |
=
| 4 |
| 15 |
| 1 |
| 4 |
| 11 |
| 15 |
| 1 |
| 4 |
=
| 1 |
| 4 |
| 4 |
| 15 |
| 11 |
| 15 |
=
| 1 |
| 4 |
=
| 1 |
| 4 |
点评:考查了运算定律与简便运算,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简便计算.
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