A= 1.2.3...9- 1.2.3...8-1.2.3...8.8
A = 1.2.3....9 - 1.2.3...8 - 1.2.3.....8.8
1.2.3......9-1.2.3....8-1.2.3.....8.8 mng giúp với ạ
=1*2*3*...*8(9-1)-1*2*3*...*8*8
=0
thuc hien phep tinh
a A=1.2.3....9-1.2.3....8-1.2.3...8.8
giúp tui mới
a, A=1.2.3...9-1.2.3...8-1.2.3...8.8
giúp mới nha
\(1.2.3.....9-1.2.3.....8-1.2.3...8.8\)
Giair nhanh mình tick!
1.2.3....9-1.2.3....8-1.2.3...8.8= 1.2.3....9-(12.3....8+1.2.3...8.8)=1.2.3...9-(1.2.3....8(1+8)=1.2.3....9-1.2.3....9=0
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1.2.3...8.9 -1.2.3...8 -1.2.3...8.8
\(1.2.3...8.9-1.2.3...8-1.2.3...8.8\\ =1.2.3.4...7\left(9-1-8\right)\\ =0.1.2...7=0\)
Chúc bn học tốt
Tính
A = 1.2.3...8.9 - 1.2.3...7.8 - 1.2.3...8.8
\(A=1.2.3.4...8.9-1.2.3.4...7.8-1.2.3...8.8\)
\(A=1.2.3...8.\left(9-1-8\right)\)
\(A=1.2.3...8.9.0\)
\(A=0\)
Vậy \(A=0\)
~ Học tốt ~
a/ 1.2.3...9-1.2.3...8-1.2.3...7.82
1.2.3...9-1.2.3...8-1.2.3...7.82
= (1.2.3.4.5.6.7).9 - (1.2.3.4.5.6.7).8 - (1.2.3.4.5.6.7).1
= (1.2.3.4.5.6.7).(9-8-1)
=(1.2.3.4.5.6.7).0
= 0
Thực hiện phép tính
a, 1.2.3. ... .9-1.2.3. ... .8-1.2.3. ... .8^2
1.2.3.4.....9-1.2.3.4....8-1.2.3...8.8=1.2.3.....8.(9-1)-1.2.3.4....8.8=1.2.3....8.8-1.2.3....8.8=0