问题
填空题
若关于x的方程x2-3x+q=0的一个根x1的值是2．则另一根x2=______，q=______．
答案
根据一元二次方程根与系数的关系可知：
x1+x2=3，
x1•x2=q，
又∵x1的值是2，
∴x2=1，q=2．
故答案为：1，2．
搜题请搜索小程序“爱下问搜题”
若关于x的方程x2-3x+q=0的一个根x1的值是2．则另一根x2=______，q=______．
根据一元二次方程根与系数的关系可知：
x1+x2=3，
x1•x2=q，
又∵x1的值是2，
∴x2=1，q=2．
故答案为：1，2．
| 阅读理解。 | ||
A.Yes, it's very nice. B. No, but we can breathe it. C. Yes, it has taste. D. No, but we can smell it. 2. What does the underlined word "They" refer to ( 指的是)? A. Wind and air. B. Smell and taste. C. A kite and a plane. D. Wind and clouds. 3. A balloon can lift people up with _________. A. hot air B. soft wind C. smell D. taste 4. What does the poem mainly (主要地) try to tell us? A. We need air sometimes. B. It's hard to stay in the air. C. Air is too little to waste. D. Air is very important to us. |
