题目内容

8.4÷0.4= 3.2×25= 1÷ $数学公式$ = $数学公式$ ×25=
3+5÷6= 18×（ $数学公式$ + $数学公式$ ）= $数学公式$ × $数学公式$ ÷ $数学公式$ × $数学公式$ = 0.8×138+62× $数学公式$ =

8.4÷0.4=21，	3.2×25=80，	1÷ $\text{[math]}$ =9，	$\text{[math]}$ ×25= $\text{[math]}$ ，
3+5÷6=3 $\text{[math]}$ ，	18×（ $\text{[math]}$ + $\text{[math]}$ ）=27，	$\text{[math]}$ × $\text{[math]}$ ÷ $\text{[math]}$ × $\text{[math]}$ = $\text{[math]}$ ，	0.8×138+62× $\text{[math]}$ =160．

分析：3.2×25先把3.2分解成8×0.4，然后运用乘法结合律简算；3+5÷6先算除法，再算加法；18×（ $\text{[math]}$ + $\text{[math]}$ ）运用乘法分配律简算； $\text{[math]}$ × $\text{[math]}$ ÷ $\text{[math]}$ × $\text{[math]}$ 先把除法变成乘法，再运用乘法结合律简算；0.8×138+62× $\text{[math]}$ 运用乘法分配律简算．
点评：本题考查了基本的计算，要注意分析式中数据，运用合适的简便方法计算．

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0.3×0.2=	3.5×2×0.1=	0.3×0.3=	0×10.3×2.2=
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5.79÷0.1=	0.35+0.65=	8.9-0.9=	9.2-9.2=
3.6÷0.4=	15.15÷15=	0.2×0.3×0.1=	1.34×4×2.5=

180÷60=	12×25=	0÷90=
4×5÷4×5=	0.25×4+4=	131+218+269+182=
25×6×4=	420÷35=	36×5×4=
120÷5÷3=	198-75-25=	120-20÷5=
59亿-58亿=	（1.3+3.5）÷0.6=	75÷2.5=
0.45÷1.25÷8=	2.5×7.6×4=	97.6÷0.02=
8.8-（0.25+0.4）=	0.25+87+0.75=	0.8-0.35×2=
0.1÷0.01×0.1=	9.9+9.9×99=	2.7×3.6+6.4×2.7=
720÷8÷9=	2.9+5.7+2.1=	2-0.16-0.64=
16.7+84.5-16.7=	6.8-（3.8+2.9）=	9×1.3+9×6.7=
5.5-5.25+5.2=	0.8×25-10=	42.8×25×4=
7.2+2.8=	0.9÷0.01=	3.5+7.6=
3×0.2×0.5=	0.96÷0.3=	1.5×0.4=
7÷0.25=	2.5×0.7×0.8=	8-2.5=
16÷1.6=	5.6×1.01=	8×（2.5+0.25）=
0.36+0.64=	64.32÷16=	72.8÷0.8=
8.4×0.2+1.6×0.2=	8.4÷4.2=	0.05×0.8=
2.56-0.37=	1.23×3=	25×0.8×0.5=
12×2.5=	3.2÷1.6=	3.5+3.5×3=
19.6÷2=	8.8÷2.2=	3.9+2.03=
7.2×0.3+2.8×0.3=	13.8+9.9=	2.4×2.5=
0.75×4=	（1.5+0.25）×4=	4.2÷0.1=
4.2÷3.5=	2.14-0.9=	27+456+73=
12÷0.3=	2.87÷0.7=	13÷4=
24÷4+56÷4=	2.1×0.3÷2.1=	2.3-0÷8.1=
1.37-1.37÷1.37=	4.4÷（5×0.2）=	7×1.3=
0.96÷0.06=	0.36×0.3=	0.35÷0.7=
13.65÷13=	4×0.8×0.25×1.25=	13+0.7÷0.7=
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728+199=	637-201=	16×25=
1.6×[（12-7.2）÷（0.84÷2.1）]=

180÷60= 12×25= 0÷90=
4×5÷4×5= 0.25×4+4= 131+218+269+182=
25×6×4= 420÷35= 36×5×4=
120÷5÷3= 198-75-25= 120-20÷5=
59亿-58亿= （1.3+3.5）÷0.6= 75÷2.5=
0.45÷1.25÷8= 2.5×7.6×4= 97.6÷0.02=
8.8-（0.25+0.4）= 0.25+87+0.75= 0.8-0.35×2=
0.1÷0.01×0.1= 9.9+9.9×99= 2.7×3.6+6.4×2.7=
720÷8÷9= 2.9+5.7+2.1= 2-0.16-0.64=
16.7+84.5-16.7= 6.8-（3.8+2.9）= 9×1.3+9×6.7=
5.5-5.25+5.2= 0.8×25-10= 42.8×25×4=
7.2+2.8= 0.9÷0.01= 3.5+7.6=
3×0.2×0.5= 0.96÷0.3= 1.5×0.4=
7÷0.25= 2.5×0.7×0.8= 8-2.5=
16÷1.6= 5.6×1.01= 8×（2.5+0.25）=
0.36+0.64= 64.32÷16= 72.8÷0.8=
8.4×0.2+1.6×0.2= 8.4÷4.2= 0.05×0.8=
2.56-0.37= 1.23×3= 25×0.8×0.5=
12×2.5= 3.2÷1.6= 3.5+3.5×3=
19.6÷2= 8.8÷2.2= 3.9+2.03=
7.2×0.3+2.8×0.3= 13.8+9.9= 2.4×2.5=
0.75×4= （1.5+0.25）×4= 4.2÷0.1=
4.2÷3.5= 2.14-0.9= 27+456+73=
12÷0.3= 2.87÷0.7= 13÷4=
24÷4+56÷4= 2.1×0.3÷2.1= 2.3-0÷8.1=
1.37-1.37÷1.37= 4.4÷（5×0.2）= 7×1.3=
0.96÷0.06= 0.36×0.3= 0.35÷0.7=
13.65÷13= 4×0.8×0.25×1.25= 13+0.7÷0.7=
7.05×23.7+7.05×76.3= 0.125×3.2×2.5= （12+23.1÷0.75）×0.4-5.12=
728+199= 637-201= 16×25=
1.6×[（12-7.2）÷（0.84÷2.1）]=

8.4÷0.4=	3.2×25=	1÷ $数学公式$ =	$数学公式$ ×25=
3+5÷6=	18×（ $数学公式$ + $数学公式$ ）=	$数学公式$ × $数学公式$ ÷ $数学公式$ × $数学公式$ =	0.8×138+62× $数学公式$ =

8.4÷0.4=3.2×25=1÷=×25=3+5÷6=18×（+）=×÷×=0.8×138+62×=

试题分类

8.4÷0.4= 3.2×25= 1÷ $数学公式$ = $数学公式$ ×25=
3+5÷6= 18×（ $数学公式$ + $数学公式$ ）= $数学公式$ × $数学公式$ ÷ $数学公式$ × $数学公式$ = 0.8×138+62× $数学公式$ =