I1+I2-I3=01.5I2+9I3-15=03I1+9I2-12=0由此简化得出:I3=I1+I2I2+6I3=10I1+3I3=4再简化:I2+6I1+6I2=10I1+3I1+3I2=4得出:6I1+7I2=104I1+3I2=4得出:12I1+14I2=2012I1+9I2=4得出:5I2=8得出:I2=8/5得出:I1=-1/5...
I2+6I3=10I1+3I3=4是怎么得出的呀?
1.5I2+9I3-15=0化简得出I2+6I3=10(方程两边同除以1.5)3I1+9I2-12=0简化得出1+3I3=4(方程两边同除以3)