9a+3b+3=0 100a+10b+5/3=0
4a+b²=0 16/3a+b²=0
要点步骤就OK
9a+3b+3=0 100a+10b+5/3=0
4a+b²=0 16/3a+b²=0
要点步骤就OK
9a+3b+3=0
3a+b +1 =0
30a+10b+10 =0 (1)
100a+10b+5/3=0 (2)
做差; 70a- 25/3 = 0
a = 5/42
b= - 19/14
2. 4a+b²=0
b²= - 4a 代入16/3a+b²=0
16/3a - 4a =0
a =0.
b = 0
9a+3b+3=0 ①
100a+10b+5/3=0 ②
10①-3②
-210a+25=0
a=5/42
代入①得
b=-19/14
第二题同上编号
②-①得
4/3a=0
a=0
代入①得
b=0
9a+3b+3=0--------① 100a+10b+5/3=0--------------②
①×100=900a+300b+300=0----------------③
②×9=900a+90b+15=0------------④
③-④=210b+285=0
210b=-285
b=-19/14
--------------------------------------------------------------------------------------------------------------------------------
4a+b²=0------------① 16/3a+b²=0 --------------②
①-②=-4/3a=0,a=0
没解