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13591 - 13589 = 13589 x ( 1352 - 1 )
135100 - 13599 = 13599 x ( 135 - 1 ) = 13599 x 134 = 13589 x 13510 x 134 = 13589 x ( 13510 x 134 )
Có : 1352 - 1 < 13510 x 134
=> 13589 x ( 1352 - 1 ) < 13589 x ( 13510 x 134 )
=> 13591 - 13589 < 135100 - 13599
Ta có:
\(135^{91}-135^{89}=135^{89}\times\left(135^2-1\right)\)
\(135^{100}-135^{99}=135^{99}\times\left(135-1\right)=135^{99}\times134=135^{89}\times134=135^{89}\times\left(135^{10}\times34\right)\)
Có: \(135^2-1< 135^{10}\times134\)
\(\Rightarrow135^{89}\times\left(135^2-1\right)< 135^{89}\times\left(135^{10}\times134\right)\)
\(\Rightarrow135^{91}-135^{89}< 135^{100}-135^{99}\)
Vậy \(135^{91}-135^{89}< 135^{100}-135^{99}\)
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B = |−100|+(135−58)−(142−865)
B = 100 + 77 - ( - 723 )
B = 100 + 77 + 723
B = 177 + 723
B = 900
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\(\frac{5}{100}+\frac{15}{40}+\frac{-27}{45}+\frac{36}{135}=\frac{11}{120}\)
Mk nhanh nhất k cho mk nhé please!
5/100 + 15/40 + -27/45 + 36/135
= 17/40 + -27/45
= -7/40 + 36/135
= 11/120
Đ/s: 11/120
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a) 13.(23+22)-3.(17+28)
= 13.45 - 3.45
= 45(13-3)
= 45.10 =450
b) -48+48.(-78)+48(-21)
= -48 + 48(-78 - 21)
= -48 + 48.(-99)
= -48 + ( -4752)
= -4800
c) 135.(171-123)-171.(135-123)
= 135.171 - 135.123 - 171.135 + 171.123
= (135.171 - 171.135) - (135.123 - 171.123)
= - 123(135 - 171) = (-123).(-36)= 4428
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235 - ( 34 + 135) -100
= 235 - 169 - 100
= 66 - 100
= 34
Chacc dungg aa:>
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235 - ( 34 + 135) - 100
= 235 - 34 - 135 - 100
= 235 - ( 135 + 100) - 34
= 235 - 235 - 34
= 0 - 34
= -34
235 - [ 34 + 135 ] - 100
= 235 - 169 - 100
= 66 - 100
= - 34
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(-135) + 135 + 100
= 0 + 100
= 100
(-135)+100+135= 100