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利用因式分解计算:(1)1002-992+982-972+…+42-32+22-12(2)1+24(52+1)(54+1)(58+1)•…•(532+1)(3)2n+4−2(2n)2(2n+2).
题目详情
利用因式分解计算:
(1)1002-992+982-972+…+42-32+22-12
(2)1+24(52+1)(54+1)(58+1)•…•(532+1)
(3)
.
22222222
24832
.
2n+4−2(2n) 2n+4−2(2n) 2n+4−2(2n)2n+4−2(2n)n+4−2(2n)2n)2n)n)2(2n+2) 2(2n+2) 2n+2)2n+2)n+2)
(1)1002-992+982-972+…+42-32+22-12
(2)1+24(52+1)(54+1)(58+1)•…•(532+1)
(3)
2n+4−2(2n) |
2(2n+2) |
22222222
24832
2n+4−2(2n) |
2(2n+2) |
2n+4−2(2n) |
2(2n+2) |
▼优质解答
答案和解析
(1)10022-9922+9822-9722+…+422-322+222-122
=(100+99)(100-99)+(98+97)(98-97)+…+(4+3)(4-3)+(2-1)(2+1)
=100+99+98+97+…+4+3+2+1
=101×50
=5050;
(2)1+24(522+1)(544+1)(588+1)•…•(53232+1)
=1+24×
×(52+1)(54+1)(58+1)•…•(532+1)
=1+564-1
=564;
(3)
=
=
.
52−1 52−1 52−12−152−1 52−1 52−12−1×(522+1)(544+1)(588+1)•…•(53232+1)
=1+56464-1
=56464;
(3)
=
=
.
2n+4−2(2n) 2n+4−2(2n) 2n+4−2(2n)n+4−2(2n)n)2(2n+2) 2(2n+2) 2(2n+2)n+2)
=
=
.
2n+1×8−2n+1 2n+1×8−2n+1 2n+1×8−2n+1n+1×8−2n+1n+12n+1×4 2n+1×4 2n+1×4n+1×4
=
.
7 7 74 4 4.
=(100+99)(100-99)+(98+97)(98-97)+…+(4+3)(4-3)+(2-1)(2+1)
=100+99+98+97+…+4+3+2+1
=101×50
=5050;
(2)1+24(522+1)(544+1)(588+1)•…•(53232+1)
=1+24×
52−1 |
52−1 |
=1+564-1
=564;
(3)
2n+4−2(2n) |
2(2n+2) |
=
2n+1×8−2n+1 |
2n+1×4 |
=
7 |
4 |
52−1 |
52−1 |
=1+56464-1
=56464;
(3)
2n+4−2(2n) |
2(2n+2) |
=
2n+1×8−2n+1 |
2n+1×4 |
=
7 |
4 |
2n+4−2(2n) |
2(2n+2) |
=
2n+1×8−2n+1 |
2n+1×4 |
=
7 |
4 |
2n+1×8−2n+1 |
2n+1×4 |
=
7 |
4 |
7 |
4 |
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