Question

(0.5+x)+x=9.8÷2 0.5x+x^2=4.9 下一步不会算了 求救

Answer 1

(0.5+x)+x=9.8÷2

0.5+2x=4.9

2x=4.4

x=2.2

0.5x+x^2=4.9

x^2+0.5x-4.9=0

x+0.5x+0.625=5.525

x-0.25=±(5.525)

x1=0.25+5.525=5.55

x2=0.25-5.525=-5.5