Tìm x, y thuộc z, biết:

/x/ + /y / = 1

Giúp mình với

Tìm x thuộc n biết:

a, 1^3 + 2^3 +....+ 10^3 = (x + 1)^2

b, 1+3+5+...+99=(x-2)^2

Giúp mình với

Rewrite these sentsnces , using 'if ' construction :

1 He smokes so much , perhaps that's why he can't get rid of his cough

=>

2 She is very shy , that's why she doesn't enjoy parties

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3 I haven't the right change so we can't get tickets from the machine

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4 They speak French to her , not English , so her Eghlish doesn't improve

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5 He doesn't work overtime , so he doesn't earn as much as I do

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6 My number isn't in the directory so people don't ring me up

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7 He is very thin perhaps that't why he feels very cold

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8 I'm far , that't why I can't get through the bathroom's window

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Help me!