题目内容
计算下面各题,能简算的要简算.
| (1)46.7-15.03-4.97 | (2)6.78×101 | ||||||||||||
(3)
|
(4)
|
分析:(1)根据连减的性质进行计算;
(2)根据乘法分配律进行计算;
(3)先计算小括号里面的减法,再计算中括号里面的减法,最后算乘法;
(4)根据乘法分配律进行计算.
(2)根据乘法分配律进行计算;
(3)先计算小括号里面的减法,再计算中括号里面的减法,最后算乘法;
(4)根据乘法分配律进行计算.
解答:解:
(1)46.7-15.03-4.97,
=46.7-(15.03+4.97),
=46.7-20,
=26.7;
(2)6.78×101,
=6.78×(100+1),
=6.78×100+6.78,
=678+6.78,
=684.78;
(3)
×[1-(
-
)],
=
×〔1-
〕,
=
×
,
=
;
(4)
÷23+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
.
(1)46.7-15.03-4.97,
=46.7-(15.03+4.97),
=46.7-20,
=26.7;
(2)6.78×101,
=6.78×(100+1),
=6.78×100+6.78,
=678+6.78,
=684.78;
(3)
| 4 |
| 29 |
| 3 |
| 4 |
| 3 |
| 8 |
=
| 4 |
| 29 |
| 3 |
| 8 |
=
| 4 |
| 29 |
| 5 |
| 8 |
=
| 5 |
| 58 |
(4)
| 8 |
| 17 |
| 1 |
| 23 |
| 9 |
| 17 |
=
| 8 |
| 17 |
| 1 |
| 23 |
| 1 |
| 23 |
| 9 |
| 17 |
=(
| 8 |
| 17 |
| 9 |
| 17 |
| 1 |
| 23 |
=1×
| 1 |
| 23 |
=
| 1 |
| 23 |
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律简便计算.
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