已知a.b为有理数,并满足5-√7a=2b+2/3√7-a,求a.b的值
5-√7a=2b+2/3√7-a
5-2/3√7=2b-a+√7a=2b-a(1-√7)
2b=5 得:b=2.5
a(1-√7)=2/3√7 得:
a=2/3√7/(1-√7)=-(7+√7) /9
已知a.b为有理数,并满足5-√7a=2b+2/3√7-a,求a.b的值
5-√7a=2b+2/3√7-a
5-2/3√7=2b-a+√7a=2b-a(1-√7)
2b=5 得:b=2.5
a(1-√7)=2/3√7 得:
a=2/3√7/(1-√7)=-(7+√7) /9