Toán Lớp 8: Rút gọn : B = (4/x-5) – (1/x+5) – (x^2-13x/25-x^2)
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Toán Lớp 8: Rút gọn : B = (4/x-5) – (1/x+5) – (x^2-13x/25-x^2)
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Mong cho lời giải hay nhất ❤️⭐️
B = (4)/(x-5) – (1)/(x+5) – (x^2-13x)/(25-x^2)(xne+-5)
= (4)/(x-5) – (1)/(x+5) +(x^2-13x)/(x^2+25)
=(4(x+5)-(x-5)+x^2-13x)/((x-5)(x+5))
=(4x+20-x+5+x^2-13x)/((x-5)(x+5))
=(x^2-10x+25)/((x-5)(x+5))
=(x-5)^2/((x-5)(x+5))
=(x-5)/(x+5)