giúp em bài tính nhanh này nha
f) 123456 . 9
i) 2345.99
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\(=\dfrac{99\cdot44.44\cdot2\cdot13.20\cdot4}{3.3\cdot88.88\cdot2\cdot6.6\cdot8\cdot5}=\dfrac{99}{3.3}\cdot\dfrac{1}{2}\cdot2\cdot\dfrac{1}{2}\cdot\dfrac{1}{5}=30\cdot\dfrac{1}{5}=6\)
123456 + (x - 1) =123456 +2005
123456 + x - 1 =125461
123455 + x =125461
x =125461-123455
x =2006
123456 + (x - 1) =123456 +2005
= (x-1)=2005
= x-1=2005
x=2005+1=2006
vậy x = 2006
=4090506-\(\dfrac{3}{2023}\)*2021+2020
=4090506-\(\dfrac{6063}{2023}\)+2020
=\(\dfrac{8279174035}{2023}\) tối giản luôn rồi nhé
S = 1/1x1/2+1/2x1/3+1/3x1/4+...+1/28x1/29+1/29+1/30
S = 1/1-1/2+1/2-1/3+1/3-1/4+...+1/28-1/29+1/29+1/30
Đến đây ta triệt tiêu,còn lại:
S = 1/1-1/30
S = 29/30
Mình chắc chắn lun!
\(25+27-48-25-37=\left(25-25\right)+\left(27-37\right)-48\)
\(=0-10-48\)
\(=-58\)
1 The meeting was canceled 3 days ago
2 She told me she was watching a film with her sister then
3 I admire the guitarist who is perfroming on the stage
4 Had it not been for Pauline's interest, the project would have been abandoned
f) 123456 . 9 = 1 111 104
i) 2345 . 99 = 232 155
123456 . 9 = 1 111 104
2345 . 99 = 232 155