设有两个浮点<img src="/Image1/74/74282406f40ac279de7e705e08c22f66.png" style="color: rgb(34, 34, 34); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: Arial, Verdana, sans-serif; font-size: 12px; font-style: normal; font-weight: 400; word-spacing: 0px; white-space: normal; cursor: default; orphans: 2; widows: 2; background-color: rgb(255, 255, 255); -webkit-text-stroke-width: 0px; font-variant-ligatures: normal; font-variant-caps: normal; text-decoration-style: initial; text-decoration-color: initial;" /> 数若尾数4位，数符1位，阶码2位，阶符1位，求x+y并写出运算步骤及结果。