5%x-31%=52%(x-150%)

cxr20042022-10-04 11:39:541条回答

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皮皮金 共回答了18个问题 | 采纳率88.9%
5%x-31%=52%x-150%*52%
52%x-5%x=78%-31%
47%x=47%
x=1
1年前

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(1)704×696 (2)(x+2y)(x-2y)+(x+1)(x-1) (3)x(x-1)-(x-31)(x+31)
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canyunhui 共回答了15个问题 | 采纳率86.7%
(1)704×696
=(700+4)(700-4)
=700²-4²
=490000-16
=489984
(2)(x+2y)(x-2y)+(x+1)(x-1)
=x²-4y²+x²-1
=2x²-4y²-1
(3)x(x-1)-(x-31)(x+31)
=x²-x-(x²-31²)
=x²-x-x²+961
=-x+961
x+log[2,(2^x-31)]=5
x+log[2,(2^x-31)]=5
log[2,(2^x-31)]
底数2
真数2^x -31
banybai1年前1
lchkr 共回答了19个问题 | 采纳率94.7%
x + log[2,(2^x-31)] = 5
log[2,(2^x-31)] = 5 - x
2^x - 31 = 2^(5 - x)
2^x - 31 = 2^5/2^x
令 u = 2^x
u^2 - 31u - 32 = 0
(u - 32)(u - 1) = 0
u = 32 .x = 5
u = 1 .x = 0 .2^x - 31 < 0

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