0.02×0.1= 5.06x-4.07x= 12-7.8= a+0.4a=
12÷0.3= 4.6x+2.7x= 1.7+0.43= 0.58a-0.47a=
1.5×0.4= 4.8x-3.1x= 1.25×0.2= 12a-8.4a=
64.32÷16= 6x-4.9x= 5.1b+11.9b= 1.23÷3=
100×0.01= 3.4×0.07= 3x+4x= 0.42÷0.1=
4.3b-2.7b= 7÷0.25= 5.1x+2.9x= 1.75×0.8=
0.3×0.4= 5.4+1.4= 2.7x+3.6x= 16÷1.6=
10x-3.7x= 0.98+1.82= 2.5x+4.3x= 0.05×0.8=
6.05x-4.96x= 3.7a+5.2a= 3.2÷1.6= 3.12÷0.5=
3.5+7.6= 5.1a+3.9a= 10×0.75= 3b-0.7b=
5.6×0.1= x×x= 0.9÷0.01= 3.4b+5.6b=
72.8÷0.8= 2.7b+5b= 3.5×3= 7.6b-4.3b=
32= 2.52= 4x+5x= 3.5t-t=
8a-3a= 7b+b= 4c-2c= 3.5b+2.7b=
0.32÷0.04= 0.51×0.2= 0.12+3.4= 102=
分析：根據(jù)小數(shù)的加、減、乘、除的方法進(jìn)行計算即可．
解答：解：
0.02×0.1=0.002 5.06x-4.07x=0.99x 12-7.8=4.2 a+0.4a=1.4a
12÷0.3=40 4.6x+2.7x=7.3x 1.7+0.43=2.13 0.58a-0.47a=0.11a
1.5×0.4=0.6 4.8x-3.1x=1.7x 1.25×0.2=0.25 12a-8.4a=3.6a
64.32÷16=4.02 6x-4.9x=1.1x 5.1b+11.9b=17b 1.23÷3=0.41
100×0.01=1 3.4×0.07=0.238 3x+4x=7x 0.42÷0.1=4.2
4.3b-2.7b=1.6b 7÷0.25=28 5.1x+2.9x=8x 1.75×0.8=1.4
0.3×0.4=0.12 5.4+1.4=6.8 2.7x+3.6x=6.3x 16÷1.6=10
10x-3.7x=6.3x 0.98+1.82=2.8 2.5x+4.3x=6.8x 0.05×0.8=0.04
6.05x-4.96x=1.09x 3.7a+5.2a=8.9a 3.2÷1.6=2 3.12÷0.5=6.24
3.5+7.6=11.1 5.1a+3.9a=9a 10×0.75=7.5 3b-0.7b=2.3b
5.6×0.1=0.56 x×x=x2 0.9÷0.01=90 3.4b+5.6b=9b
72.8÷0.8=91 2.7b+5b=7.7b 3.5×3=10.5 7.6b-4.3b=3.3b
32=9 2.52=6.25 4x+5x=9x 3.5t-t=2.5t
8a-3a=5a 7b+b=8b 4c-2c=2c 3.5b+2.7b=6.2b
0.32÷0.04=8 0.51×0.2=0.102 0.12+3.4=3.52 102=100
點評：口算題目，要求快速準(zhǔn)確，能用簡便方法的要用簡便方法，注意有字母的計算．
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