题目内容
用简便方法计算 16×
|
|
6
|
分析:(1)去括号,分子和分母交叉约分后再乘;
(2)把中括号里的小括号去掉,改写成[
+
-
],从而简算;
(3)把3.5÷1
改写成3.5×
,进而逆用乘法分配律简算.
(2)把中括号里的小括号去掉,改写成[
3 |
4 |
1 |
4 |
7 |
16 |
(3)把3.5÷1
2 |
3 |
3 |
5 |
解答:解:(1)16×
×(9×
),
=16×
×9×
,
=12;
2 |
3 |
1 |
8 |
=16×
2 |
3 |
1 |
8 |
=12;
(2)
=
=
=
(3)6
=6.5×
=(6.5+3.5)×
=6. |
点评:此题考查了运算定律与简便运算、四则混合运算,计算时要注意运算顺序和运算法则,并灵活运用所学的运算律简便计算.
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能简算的要用简便方法计算.
*16.45÷[(18.2-3.6×4.5)÷0.8] =
[ ]
A.0.8 |
B.3 |
C.3.4 |
D.6.58 |
能简算的要用简便方法计算.
*16.45
÷[(18.2-3.6×4.5)÷0.8] =[
]
A .0.8 |
B .3 |
C .3.4 |
D .6.58 |