口算0.17×5=0.22×4=0×19.8=0.2×0.5=0.63÷0.7=1.8÷30=5.6÷4=1.21÷1.1=

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解：0.17×5=0.850.22×4=0.880×19.8=00.2×0.5=0.10.63÷0.7=0.91.8÷30=0.065.6÷4=1.41.21÷1.1=1.1
解析分析：根据小数乘除法的法则进行计算即可．

点评：此题主要考查小数乘除法的口算能力．