200x²-100x+12=0
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200x²-100x+12=0200x²-100x+12=0200x²-100x+12=0200x²-100x+12=050x²-25x+3=0x=-
200x²-100x+12=0
200x²-100x+12=0
200x²-100x+12=0
200x²-100x+12=0
50x²-25x+3 =0
x=-(-25)+/-√（-25）²-4*50*3
x=25+/-√25
x=25+/-5
∴x1=25+5=30,x2=25-5=20