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28-28÷28=0
错误
错误
分析:28-28÷28先算除法,再算减法的顺序求解,算出结果与0比较即可.
解答:解:28-28÷28,
=28-1,
=27;
27≠0;
故答案为:错误.
点评:一个算式里面既有加减、又有乘除法,先算乘除、再算加减.
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科目:小学数学 来源: 题型:

小数乘法速算法
下面一些题都是根据定律和性质使小数乘法的运算简便.你能说出各题都应用了哪些定律或性质吗?
①0.25×3.2                  
=0.25×(4×0.8)
=0.25×4×0.8
=1×0.8
=0.8
②20.8×1.25
=(20+0.8)×1.25
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=25+1
=26
③3.28×0.5                  
=(3.28÷2)×(0.5×2)
=1.64×1
=1.64
④1.25×7.2
=(1.25×8)×(7.2÷8)
=10×0.9
=9
做一做
(1)0.25×4.4
(2)4.8×1.25
(3)1.25×10.8
(4)52.4×0.5.

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科目:小学数学 来源: 题型:

3.2+4.8= 6.3-0.94= 0.25×4= 5×1.2=
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8-3.4= 6×0.21= 1.25×8= 0.8÷0.5=
25×0.3= 0.63-0.3= 2.5+7.5= 34×0.1=
7-0.99= 21÷0.7= 5×2.4= 3×1.03=
3.2÷4= 1.5÷30= 5.1÷3= 0.37÷0.37=
0.28÷14= 0.16÷4= 8×0.05= 4×0.125=
4÷8= 7.5-0.7= 9-0.9= 7÷2=
2.8÷0.7= 21-0.21= 5÷0.01= 2.8×0=
7÷0.07= 6.3÷0.5= 0.32÷0.8= 1÷0.25=
0.25×0.4= 30×2.3= 3.6÷1.2= 2.5+1.2=
3.5×0.2= 9÷0.45= 0.96÷0.16= 4.8-2.9=
0.5÷0.25= 7.6+2.4= 0.17×0.4= 8.2×0.01=
1.72-0.73= 0.46÷2= 1.9×0.8= 1.2×0.3=
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科目:小学数学 来源: 题型:阅读理解

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科目:小学数学 来源: 题型:解答题

3.2+4.8=6.3-0.94=0.25×4=5×1.2=
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