1.tinh 16-10 = 222-188
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Ta có 11..11 ( n số ) = (10^n-1):9
= 2 ( 1 + 11 + 111 + ................. + 11...1 )
= 2 ( 10^1 + 10^2 + 10^ 3 + ........ + 10^ 50 - 50 ) :9
10 ^ 1 + 10^ 2 + 10^ 3 + ................ + 10^ 50 -50 = (10^51 - 1 ) : 9 -50
Biểu thức = 2 ( 10^51 - 451 ) : 81
SO SANH 10A ;10B\
10A=10^16+10/10^16+1
=1+\(\frac{9}{10^{16}}\) +1
10B =10^17+10/10^17+1
=1+\(\frac{9}{10^{17+1}}\)
=>9/10^16>10^17+1
=>10A>10B
=>A>B
K NHE
15.(16-222)-16.(15-222)
=15.16-15.222-(16.15-16.222)
=15.16-15.222-16.15+16.222
=-15.222-16.222
=222.(-15+16)
=222.1
=222
\(15\times\left(16-222\right)-16\times\left(222+15\right)\)
\(=15\times16-15\times222-16\times222-16\times15\)
\(=\left(15\times16-16\times15\right)-\left(15\times222+16\times222\right)\)
\(=0-222\times\left(15+16\right)\)
\(=-222\times31=-6882\)
15×(16−222)−16×(222+15)15×(16−222)−16×(222+15)
=15×16−15×222−16×222−16×15=15×16−15×222−16×222−16×15
=(15×16−16×15)−(15×222+16×222)=(15×16−16×15)−(15×222+16×222)
=0−222×(15+16)=0−222×(15+16)
=−222×31=−6882
\(15.\left(16-222\right)-16.\left(15-222\right)\)
\(=15.16-15.222-16.15+16.222\)
\(=\left(15.16-16.15\right)-\left(15.222-16.222\right)\)
\(=0-\left[222.\left(15-16\right)\right]\)
\(=0-\left[222.\left(-1\right)\right]\)
\(=0-\left(-222\right)\)
\(=0+222\)
\(=222\)
15( 16 - 222 ) - 16(15 - 222 )
= 15 . 16 - 15 . 222 - 16 . 15 - 16 . 222
= ( 15.16 - 16.15 ) - ( 15.222 - 16.222 )
= 0 - 222.( 15 - 16 )
= 0 - 222. ( - 1 )
= 0 - ( - 222 ) = 222
16-10=6
222-188=34
16-10=6
222-188=34