Câu hỏi của Đào Anh Thư ^_~

Question

HT.Phong (9A5) · Accepted Answer

$A=555\cdot554555-554\cdot555554\
=555\cdot\left(554\cdot1000+555\right)-554\cdot\left(555\cdot1000+554\right)\
=555\cdot554\cdot1000+555^2-555\cdot554\cdot1000-554^2\
=\left(555\cdot554\cdot1000-555\cdot554\cdot100\right)+\left(555^2-554^2\right)\
=555^2-554^2\
=555^2-555\cdot554+555\cdot554-554^2\
=555\cdot\left(555-554\right)+554\cdot\left(555-1\right)\
=555+554\
=1109$Câu trả lời: $A=555\cdot554555-554\cdot555554\
=555\cdot\left(554\cdot1000+555\right)-554\cdot\left(555\cdot1000+554\right)\
=555\cdot554\cdot1000+555^2-555\cdot554\cdot1000-554^2\
=\left(555\cdot554\cdot1000-555\cdot554\cdot100\right)+\left(555^2-554^2\right)\
=555^2-554^2\
=555^2-555\cdot554+555\cdot554-554^2\
=555\cdot\left(555-554\right)+554\cdot\left(555-1\right)\
=555+554\
=1109$

Toru · Answer

`A=555.554555-554.555554``=555.(555555-1000)-(555-1).555554``=555.555555-555.1000-555.555554+555554``=555.(555555-555554)-555000+555554``=555.1+554``=555+554=1109`Câu trả lời: `A=555.554555-554.555554``=555.(555555-1000)-(555-1).555554``=555.555555-555.1000-555.555554+555554``=555.(555555-555554)-555000+555554``=555.1+554``=555+554=1109`

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