⒈20x+32x-x^2=540
⒉2x^2-(4x+2x)-4=312
⒈20x+32x-x^2=540
⒉2x^2-(4x+2x)-4=312
你有学过△求根公式吗?
1.
x²-52x+540=0
x1=(52+根号下52²-4×540)÷2
x2=(52-根号下52²-4×540)÷2
2.
x²-3x-158=0
x1=(3+根号下9+158×4)÷2
x2=(3-根号下9+158×4)÷2
用计算器算下就行了~~~~~~~
1
x²-52x+540=0
x=【52±√(52²-4*540)】/2
x=26±2√34
2
2x²-6x-316=0
x²-3x-158=0
x=(3±√641)/2
1.
x²-52x+540=0
x1=(52+根号下52²-4×540)÷2
x2=(52-根号下52²-4×540)÷2
2.
x²-3x-158=0
x1=(3+根号下9+158×4)÷2
x2=(3-根号下9+158×4)÷2