x²+0.7x-0.78=0
x²+0.7x=0.78
x²+0.7x+0.35²=0.1225+0.78
(x+0.35)²=0.9025
x+0.35=±0.95
x=±0.95-0.35
x1=0.6
x2=-1.3
数学.解方程、、详细过程,谢谢x²+0.7x-0.78=0 详细过程,谢谢
x²+0.7x-0.78=0
x²+0.7x=0.78
x²+0.7x+0.35²=0.1225+0.78
(x+0.35)²=0.9025
x+0.35=±0.95
x=±0.95-0.35
x1=0.6
x2=-1.3