求适合下列各式的x的值 :25x²-49=0(x<0)
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求适合下列各式的x的值 :25x²-49=0(x<0)
求适合下列各式的x的值 :25x²-49=0(x<0)
求适合下列各式的x的值 :25x²-49=0(x<0)
25x^2=49
x^2=49/25
x=7/5或x=-7/5
又因为x<0,故x只能等于-7/5
25x²-49=0(x<0)
(5x)²=49 (x<0)
-5x=7
x=-7/5