Toán Lớp 6: Tính phép tính đâu rồi tìm x:
A=1/1.2+1/2.3+….+1/99.100
A.x=(1-1/1)(1-1/2)(1-1/3)…(1-1/100)
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Toán Lớp 6: Tính phép tính đâu rồi tìm x:
A=1/1.2+1/2.3+….+1/99.100
A.x=(1-1/1)(1-1/2)(1-1/3)…(1-1/100)
Comments ( 2 )
A=1-1/2+1/2-1/3+…+1/99-1/100
A=1-1/100
A=100/100-1/100
A=99/100
=>A.x=(1-1/1)(1-1/2)(1-1/3)…(1-1/100)
=>A.x=(1-1)(1-1/2)(1-1/3)…(1-1/100)
=>A.x=0(1-1/2)(1-1/3)…(1-1/100)
=>99/100. x=0
=>x=0:99/100
=>x=0
Vậy x=0