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(36*163+36*113) : (9*25)
=[36x(163+113)] : 225
=[36x276] : 225
=9936 : 225=1104/25=44,16
( 36 * 163 + 36 * 113 ) : ( 9 * 25 )
= [ ( 163 + 113 ) * 36 ] : 225
= ( 276 * 36 ) : 225
= 9936 : 225 = 44,16
\(A=\dfrac{113^{20}+113-112}{113^{19}+1}=113-\dfrac{112}{113^{19}+1}\)
\(B=\dfrac{113^{19}+113-112}{113^{18}+1}=113-\dfrac{112}{113^{18}+1}\)
mà \(113^{19}+1>113^{18}+1\)
nên \(A>B\)
a= -77 x 113+45 x 23+77 x 158
a = -77 x 113 + 77 x 158 + 45 x 23
a = 77 x (-113 ) + 77 x 158 + 45 x 23
a = 77x [ (-113) + 158 ] + 45 x 23
a = 77 x 45 + 45 x 23
a = 45 x ( 77 + 23 )
a = 45 x 100
a = 4500
Hok tốt !
a=-77.113+45.23+77.158
a=77.(-113+158)+45.23
a=77.45+45.23
a=45.(77+23)
a=45.100
a=4500
\(-567-\left(-113\right)+\left(-69\right)-\left(113-567\right)\)
\(=-567+113+\left(-69\right)-113+567\)
\(=\left(-567+567\right)+\left(113-113\right)+\left(-69\right)\)
\(=\left(-69\right)\)
\(-567-\left(-113\right)+\left(-69\right)-\left(113-567\right)\)
\(=-567+113-69-113+567\)
\(=\left(-567+567\right)+\left(113-113\right)-69\)
\(=0+0-69=-69\)
a)
4 5 . x = 4 7 x = 4 7 : 4 5 x = 4 7 . 5 4 x = 5 7
b)
3 4 : x = 1 2 x = 3 4 : 1 2 x = 3 4 .2 x = 3 2
c)
x : 8 11 = 11 3 x = 11 3 . 8 11 x = 8 3
39.(191 - 113) - 29.(191 - 113) = 39.78 - 29.78 = 78.(39 - 29) = 78.10 = 780
113x48+87x62+62x113+38x87
=113x(48+62)+87x(62+38)
=113x110+87x100
=12430+8700
=21130
13.(29 - 113)+113.(13 - 29)
= 13.29 - 13.113+113.13 - 113.29
=(13.29 - 113.29)+(113.13 - 113.13)
= 29(13-113) + 0
= 29.(-100)
=-2900
\(\left(-133\right).36+45.\left(-133\right).\left(-133\right).19\)