Toán Lớp 8: Rút gọn : M = [ ((a-1)^2)/(3a + (a – 1)^2) – (1 – 2a^2 + 4a)/(a^3 – 1) + 1/(a – 1)] : (a^3 + 4a )/ (4a^2)
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Toán Lớp 8: Rút gọn : M = [ ((a-1)^2)/(3a + (a – 1)^2) – (1 – 2a^2 + 4a)/(a^3 – 1) + 1/(a – 1)] : (a^3 + 4a )/ (4a^2)
Comments ( 1 )
M=[(a-1)^2/(3a+a^2-2a+1)-(1-2a^2+4a)/((a-1)(a^2+a+1))+(a^2+a+1)/((a-1)(a^2+a+1))] . (4a^2)/(a^3+4a)
M=[(a-1)^2/(a^2+a+1)-(1-2a^2+4a)/((a-1)(a^2+a+1))+(a^2+a+1)/((a-1)(a^2+a+1))] . (4a^2)/(a.(a^2+4))
M=[(a-1)^3/((a-1)(a^2+a+1))-(1-2a^2+4a)/((a-1)(a^2+a+1))+(a^2+a+1)/((a-1)(a^2+a+1))] . (4a^2)/(a.(a^2+4))
M=((a-1)^3-1+2a^2-4a+a^2+a+1)/((a-1)(a^2+a+1)) . (4a^2)/(a.(a^2+4))
M=(a^3-3a^2+3a-1-1+2a^2-4a+a^2+a+1)/((a-1)(a^2+a+1)) . (4a^2)/(a.(a^2+4))
M=(a^3-1)/((a-1)(a^2+a+1)) . (4a^2)/(a.(a^2+4))
M=((a-1)(a^2+a+1))/((a-1)(a^2+a+1)) . (4a^2)/(a.(a^2+4))
M=1. (4a)/(a^2+4)
M=(4a)/(a^2+4)
Vậy M=(4a)/(a^2+4) với a\ne0;1