题目内容
用简便方法计算.
6×(
+
+
×
)
8.5×99+8.5
÷5+
×
.
6×(
1 |
2 |
1 |
3 |
2 |
3 |
1 |
5 |
8.5×99+8.5
1 |
3 |
2 |
3 |
1 |
5 |
考点:运算定律与简便运算
专题:运算定律及简算
分析:①6×(
+
+
×
),运用乘法分配律简算;
②8.5×99+8.5,运用乘法分配律简算;
③
÷5+
×
,把除数转化为乘它的倒数,再运用乘法分配律简算.
1 |
2 |
1 |
3 |
2 |
3 |
1 |
5 |
②8.5×99+8.5,运用乘法分配律简算;
③
1 |
3 |
2 |
3 |
1 |
5 |
解答:
解:①6×(
+
+
×
)
=6×
+6×
+6×
×
=3+2+
=5
;
②8.5×99+8.5
=8.5×(99+1)
=8.5×100
=850;
③
÷5+
×
=
×
+
×
=(
+
)×
=1×
=
.
1 |
2 |
1 |
3 |
2 |
3 |
1 |
5 |
=6×
1 |
2 |
1 |
3 |
2 |
3 |
1 |
5 |
=3+2+
4 |
5 |
=5
4 |
5 |
②8.5×99+8.5
=8.5×(99+1)
=8.5×100
=850;
③
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 |
点评:此题考查的目的是灵活运用乘法分配律对小数、分数四则混合运算进行简便计算.
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