初一数学题:多项式xy²-8xy+3x²y+25的二次项为()多项式xy²-8xy+3x²y+25的二次项为()A.3 B.-8 C.-3/2 D.3/2
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![初一数学题:多项式xy²-8xy+3x²y+25的二次项为()多项式xy²-8xy+3x²y+25的二次项为()A.3 B.-8 C.-3/2 D.3/2](/uploads/image/z/5296553-17-3.jpg?t=%E5%88%9D%E4%B8%80%E6%95%B0%E5%AD%A6%E9%A2%98%EF%BC%9A%E5%A4%9A%E9%A1%B9%E5%BC%8Fxy%26%23178%3B-8xy%2B3x%26%23178%3By%2B25%E7%9A%84%E4%BA%8C%E6%AC%A1%E9%A1%B9%E4%B8%BA%EF%BC%88%EF%BC%89%E5%A4%9A%E9%A1%B9%E5%BC%8Fxy%26%23178%3B-8xy%2B3x%26%23178%3By%2B25%E7%9A%84%E4%BA%8C%E6%AC%A1%E9%A1%B9%E4%B8%BA%EF%BC%88%EF%BC%89A.3+++++++B.-8+++++++++C.-3%2F2++++D.3%2F2)
初一数学题:多项式xy²-8xy+3x²y+25的二次项为()多项式xy²-8xy+3x²y+25的二次项为()A.3 B.-8 C.-3/2 D.3/2
初一数学题:多项式xy²-8xy+3x²y+25的二次项为()
多项式xy²-8xy+3x²y+25的二次项为()
A.3 B.-8 C.-3/2 D.3/2
初一数学题:多项式xy²-8xy+3x²y+25的二次项为()多项式xy²-8xy+3x²y+25的二次项为()A.3 B.-8 C.-3/2 D.3/2
-8
因为xy2的次数为1+2=3次
-8xy的次数为1+1=2次
3x2y的次数为2+1=次
25为常数项
所以B、
补充一句,二次项应该是-8xy,-8是二次项系数吧
多项式xy²-8xy+3x²y+25的二次项系数为-8
选B
-8xy是二次项,选B
其他为三次项和常数项。
B
从左至右依次为:三次,二次,三次,零次
B,字母指数之和就是就是这一项的次数