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ngăn trên có 30 cái kéo
ngăn dưới có 56 cái kéo
vậy ngăn dưới hơn ngăn trên 26 cái kéo
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x + y = x
<=>y = x-x
<=>y = 0
Thay y = 0 ta được :
x + 0 = x ( luôn đúng)
Vậy y = 0 với mọi x
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1x2= 2 1x2x3=6 1x2x3x4=24 1x2x3x4x5=120 1x2x3x4x5x6=720 1x2x3x4x5x6x7=5040
1x2x3x4x5x6x7x8=40320 1x2x3x4x5x6x7x8x9=362880 1x2x3x4x5x6x7x8x9x10=3628800
1 x 2 = 2
1 x 2 x 3 = 6
1 x 2 x 3 x 4 = 24
1 x 2 x 3 x 4 x 5 = 120
1 x 2 x 3 x 4 x 5 x 6 = 720
1 x 2 x 3 x 4 x 5 x 6 x 7 = 5040
1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 = 40320
1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 x 9 = 362880
1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 x 9 x 10 = 3628800
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3 + 7 + x = 10
10 + x = 10
x = 10 - 10
x = 0
Answer : 0
x-5=1
x =5+1
x =6
vậy x=6
x= 6 nhé
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