计算4X²-7X+2=01. 4X²-7X+2=02. 2X²-3X-1=03. 3M²-M-5=04. 4X²-1=6X

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计算4X²-7X+2=01.4X²-7X+2=02.2X²-3X-1=03.3M²-M-5=04.4X²-1=6X计算4X²-7X+2=01

计算4X²-7X+2=01. 4X²-7X+2=02. 2X²-3X-1=03. 3M²-M-5=04. 4X²-1=6X
计算4X²-7X+2=0
1. 4X²-7X+2=0
2. 2X²-3X-1=0
3. 3M²-M-5=0
4. 4X²-1=6X

计算4X²-7X+2=01. 4X²-7X+2=02. 2X²-3X-1=03. 3M²-M-5=04. 4X²-1=6X
原式为ax²+bx+c=0
当b²-4ac>=0时有两个根
x1=(-b+√(b²-4ac))/2a
x2=(-b-√(b²-4ac))/2a
当b²-4ac