小佳m岁,小华比小佳大2岁,比小兰年轻4岁,小兰的年龄是m+6岁. .
: =15÷ == (填小数).
= : ==6÷ .
0.6==18÷ = :10= %
:8=0.8: =0.2= .
8: ===2.4÷ = (填小数)