题目内容
脱式计算,注意能简算的要简算. 4.8×2.35+2.35×5.2 | 6÷[(
| ||||||||
| 0.5÷[(
| ||||||||
(0.8-
| 2012×
|
考点:分数的四则混合运算,运算定律与简便运算,分数的简便计算
专题:运算顺序及法则,运算定律及简算
分析:(1)根据乘法分配律进行简算;
(2)先算减法,再算中括号里面的除法,最后算括号外面的除法;
(3)根据乘法分配律进行简算;
(4)先算加法,再算乘法,最后算除法;
(5)先算减法,再算除法;
(6)根据乘法分配律进行简算.
(2)先算减法,再算中括号里面的除法,最后算括号外面的除法;
(3)根据乘法分配律进行简算;
(4)先算加法,再算乘法,最后算除法;
(5)先算减法,再算除法;
(6)根据乘法分配律进行简算.
解答:
解:(1)4.8×2.35+2.35×5.2
=(4.8+5.2)×2.35
=10×2.35
=23.5;
(2)6÷[(
-
)÷
]
=6÷[
÷
]
=6÷
=18;
(3)
×12+3÷
=
×12+3×
=
×(12+3)
=
×15
=9;
(4)0.5÷[(
+
)×0.2]
=0.5÷[
×0.2]
=0.5÷
=2;
(5)(0.8-
)÷(1-
)
=
÷
=
;
(6)2012×
=(2011+1)×
=2011×
+1×
=2010+
=2010
.
=(4.8+5.2)×2.35
=10×2.35
=23.5;
(2)6÷[(
11 |
12 |
2 |
3 |
3 |
4 |
=6÷[
1 |
4 |
3 |
4 |
=6÷
1 |
3 |
=18;
(3)
3 |
5 |
5 |
3 |
=
3 |
5 |
3 |
5 |
=
3 |
5 |
=
3 |
5 |
=9;
(4)0.5÷[(
1 |
2 |
3 |
4 |
=0.5÷[
5 |
4 |
=0.5÷
1 |
4 |
=2;
(5)(0.8-
1 |
2 |
4 |
7 |
=
3 |
10 |
3 |
7 |
=
7 |
10 |
(6)2012×
2010 |
2011 |
=(2011+1)×
2010 |
2011 |
=2011×
2010 |
2011 |
2010 |
2011 |
=2010+
2010 |
2011 |
=2010
2010 |
2011 |
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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