3吨的 是吨; 0.6平方米的 是平方米
×4 9× ×9 ×
×0.5 0.9× ×9 0.8× 0.5
×16= × = ×2.7= ×3.5=
44× = × = × = × =
4× = × = 8.4× = × =
3.8× = 12× = ×2.5= + =
× × = 72× × =