一个圆柱底面周长和高都扩大2倍,体积就扩大4倍. (判断对错)
4:5==20: = %
3÷8==24: = %.
0.2: == ﹣== %
0.6: =9.6÷ =1.2= %.
0.75=3÷ = :16== %