题目内容

0.125×21.01-0.125×1.97-0.125×3.04．
分析：通过观察，此题可运用乘法分进行简算．
解答：解：0.125×21.01-0.125×1.97-0.125×3.04，
=0.125×（21.01-1.97-3.04），
=0.125×16，
=2．
点评：仔细观察算式特点，灵活运用运算定律，进行简算．
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0.36÷9= 3.97-2.45= 16×25= 5.2+3.8=
8.282÷8.2= 10-0.87= 4.3+1.8= 18.9-9.8=
0.8÷0.1= 0.3+0.36= 1.14×0.2= 7.8÷3=
0.8×15= 0.125×8= 4-1.08= 9×1.8=
1.2×8= 7.82+1.18= 30.5÷2= 1.8×0.2=
0.75÷30= 0.25×3= 4.8+1.2= 0.5×48=
0.7×7= 1.1×9= 25×0.8= 3.2×5=
3×1.2= 2.04×4= 0.72+2.8= 0×3.97=
0.13×80= 18×30= 50×4.1= 0.125×2=
6×0.75= 1.01-0.89= 9.767×0= 0.02×0.3=
3.9÷5= 1÷0.125= 70÷5= 0÷9.126=
0.72= 16.5÷0.15= 7÷1.4= 1.21÷11=
0.84÷0.42= 0.7×0.9= 0.3×400= 5.1÷0.3=
8.3+1.7= 4.9÷0.7= 0.3+0.3+0.3= 0.81÷0.9×5=
（0.9+8.1）×5= 0.32= 9.3÷（4.2-1.1）= 1.7×0.6÷1.7=
0.1×7.2= 4.2÷0.6= 0.8×0.4=
1.01×10= 0.8×0.125= 21.5÷100=
18÷5= 0.4+0.4÷0.4= 4.4×0.5=
0.57+0.3= 1÷0.25= 0.5×（7.2+2.8）=
直接写得数
125×8=		 25×4= 1.21+1.22= 2-1.01=
5
8
+
7
8
=		 1-
1
2
-
1
2
=		 27.8-4.8= 0.6+0.4=
20×140= 500×30=
0.125×21.01-0.125×1.97-0.125×3.04．

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