tinh
(72003+72002):72001
(169-42).(169-52).........(169-132)
1+4+5+9+....+97
Tính
E=(169-4^2).(169-5^2).(169-6^2).(169-7^2).(169-8^2).(169-9^20).(169-10^2).(169-11^2).(169-12^2).(169-13^2)
tinh nhanh dau cham la nhan
(169-4^2).(169-5^2).....(169-13^2)
=(169-4^2).(169-5^20).....(169-169)
= 169-4^2).(169-5^20).......0
= 0
tinh nhanh
S= -(169-1^2).(169-2^2)......(169-100^2)
(54+47).(89-27).(24-42)
(169-42).(169-52)......(169-132)
(169-42)(169-52)(169-62)..............(169-142)(169-152)
( 169 - 42 ).( 169 - 52 ).( 169 - 62 )........( 169 - 142 ).( 169 - 152 )
= ( 132 - 42 ).( 132 - 52 ).( 132 - 62 )........( 132 - 132 ).( 132 - 142 ).( 132 - 152 )
= ( 132 - 42 ).( 132 - 52 ).( 132 - 62 ) ........0.( 132 - 142 ).( 132 - 152 )
= 0
(169-4^2)(169-5^2).....(169-13^2)
tinh B
B=81.[12-12/7-12/289-12/85/4-4/7-4/289-4/85:5+5/13=5/169+5/91/6+6/13+6/169+6/91].158158158/711711711
giống bài mình cần mà ko có ai trả lời nhỉ
mong mọi người vô giúp 2 đứa mình với
B=81.(12.(1-1/7-1/289-1/85)/4.(1-1/7-1/289-1/85:5.(1+1/13+1/169+1/91)/6.(1+1/13+1/169+1/91).158158158/711711711
=81.(12/4:5/6).158.1001001/711.1001001
=81.18/5.158/711
=324/5
Tính : (169 - 4^2) . (169 - 5^2) ... (169 - 13^2)
(169-42).(169-52)…(169-122).(169-132)
=(169-42).(169-52)…(169-122).(169-169)
=(169-42).(169-52)…(169-122).0
=0
(169 - 4^2) . (169 - 5^2) ... (169 - 13^2)
=(169-4^2).(169-5^2)...(169-169)
=0
(169 - 4 mũ 2) (169 -5 mũ 2) ...( 169 - 13 mũ 2)
(169 - 4 mũ 2) (169 -5 mũ 2) ...( 169 - 13 mũ 2)
= (169-42)(169-52)...(169-132)
=(199-42)(169-52)...(169-169)
=_____________...0
= 0