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.

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=

解：0.02×0.1=0.0025.06x-4.07x=0.99x12-7.8=4.2a+0.4a=1.4a12÷0.3=404.6x+2.7x=7.3x1.7+0.43=2.130.58a-0.47a=0.11a1.5×0.4=0.64.8x-3.1x=1.7x1.25×0.2=0.2512a-8.4a=3.6a64.32÷16=4.026x-4.9x=1.1x5.1b+11.9b=17b1.23÷3=0.41100×0.01=13.4×0.07=0.2383x+4x=7x0.42÷0.1=4.24.3b-2.7b=1.6b7÷0.25=285.1x+2.9x=8x1.75×0.8=1.40.3×0.4=0.125.4+1.4=6.82.7x+3.6x=6.3x16÷1.6=1010x-3.7x=6.3x0.98+1.82=2.82.5x+4.3x=6.8x0.05×0.8=0.046.05x-4.96x=1.09x3.7a+5.2a=8.9a3.2÷1.6=23.12÷0.5=6.243.5+7.6=11.15.1a+3.9a=9a10×0.75=7.53b-0.7b=2.3b5.6×0.1=0.56x×x=x20.9÷0.01=903.4b+5.6b=9b72.8÷0.8=912.7b+5b=7.7b3.5×3=10.57.6b-4.3b=3.3b32=92.52=6.254x+5x=9x3.5t-t=2.5t8a-3a=5a7b+b=8b4c-2c=2c3.5b+2.7b=6.2b0.32÷0.04=80.51×0.2=0.1020.12+3.4=3.52102=100解析分析：根据小数的加、减、乘、除的方法进行计算即可．点评：口算题目，要求快速准确，能用简便方法的要用简便方法，注意有字母的计算．

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