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\(79+58-23+29+56-79\)
\(=\left(79-79\right)+\left(58-23\right)+\left(29+56\right)\)
\(=0+35+85\)
\(=120\)
a) 5 8 . − 2 9 + 5 8 . − 7 9 + 1 1 3 . − 5 8 = 5 8 − 2 9 + − 7 9 + − 4 3 = − 35 24
b) 8 5 7 + 3 , 15 + 1 2 7 + 4 , 35 = 8 5 7 + 1 2 7 + ( 3 , 15 + 4 , 35 ) = 14 , 5
a) 5 8 . − 2 9 + 5 8 . − 7 9 + 1 1 3 . − 5 8 = 5 8 − 2 9 + − 7 9 + − 4 3 = − 35 24
b) 8 5 7 + 3 , 15 + 1 2 7 + 4 , 35 = 8 5 7 + 1 2 7 + 3 , 15 + 4 , 35 = 14 , 5
a ) 7 3 5 − 2 5 7 + 5 3 5 = 7 3 5 − 5 3 5 − 2 5 7 = 2 − 19 7 = − 5 7 .
b ) 8 2 9 − 4 2 9 − 5 1 2 = 8 2 9 − 4 2 9 + 5 1 2 = 4 + 11 2 = 19 2 c ) 5 8 . − 2 9 + 5 8 . − 7 9 + 1 1 3 . − 5 8 = 5 8 − 2 9 + − 7 9 + − 4 3 = − 35 24 d ) 8 5 7 + 3,15 + 1 2 7 + 4,35 = 8 5 7 + 1 2 7 + ( 3,15 + 4,35 ) = 14,5
\(29.\left(79-34\right)-79.\left(29+34\right)\)
\(=29.79-29.34-79.29-79.34\)
\(=0-34.\left(29+79\right)\)
\(=0-34.108\)
\(=0-3672\)
\(=-3672\)
\(29.\left(79-34\right)-79.\left(29+34\right)\)
\(=29.79-29.34-79.29-79.34\)
\(=\left(29.79-79.29\right)-34.\left(29+79\right)\)
\(=0-34.108\)
\(=0-3672\)
\(=-3672\)
\(\frac{4x\left(2x29x39+2x59x79\right)}{9x29x39+9x59x79-29x39-59x79}\) =
\(\frac{8x29x39+8x59x79}{29x39x\left(9-1\right)+59x79x\left(9-1\right)}\) =
\(\frac{8x29x39+8x59x79}{29x39x8+59x79x8}\)= \(1\)
-79 . ( 76 - 29 ) - 76 . ( -79 + 29 )
= -79.76+79.29+76.79-76.29
= ( -79.76-76.79 ) +79.(29+76)
= 0+79.105
=105
[ ( -50 + 79 ) ( 115 - 45 ) ] : 58
= ( 29 . 70 ) : 58
= 2030 : 58 = 35
[(-50+79)(115-45)]:58
=[29.70]:58
=2030:58
=35
CHÚC EM HỌC TỐT
TL
=2500
Hok tốt ~~~