题目内容
怎样算简便就怎样算.
①2.6×(2.205÷2.1)
②
+
×
+
③
×5+
÷
.
①2.6×(2.205÷2.1)
②
| 1 |
| 3 |
| 2 |
| 3 |
| 5 |
| 6 |
| 4 |
| 9 |
③
| 16 |
| 27 |
| 11 |
| 27 |
| 1 |
| 5 |
分析:①先算括号内的除法,再算括号外的乘法;
②先算乘法,再运用加法结合律简算;
③把除法改为乘法,运用乘法分配律简算.
②先算乘法,再运用加法结合律简算;
③把除法改为乘法,运用乘法分配律简算.
解答:解:①2.6×(2.205÷2.1),
=2.6×1.05,
=2.73;
②
+
×
+
,
=
+
+
,
=
+(
+
),
=
+1,
=1
;
③
×5+
÷
,
=
×5+
×5,
=(
+
)×5,
=1×5,
=5.
=2.6×1.05,
=2.73;
②
| 1 |
| 3 |
| 2 |
| 3 |
| 5 |
| 6 |
| 4 |
| 9 |
=
| 1 |
| 3 |
| 5 |
| 9 |
| 4 |
| 9 |
=
| 1 |
| 3 |
| 5 |
| 9 |
| 4 |
| 9 |
=
| 1 |
| 3 |
=1
| 1 |
| 3 |
③
| 16 |
| 27 |
| 11 |
| 27 |
| 1 |
| 5 |
=
| 16 |
| 27 |
| 11 |
| 27 |
=(
| 16 |
| 27 |
| 11 |
| 27 |
=1×5,
=5.
点评: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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