a, 1/2 - (-3)^2 + 1/3
=1/2 + 3^2 + 1/3
=1/2 + 9 + 1/3
=3/6 + 54/6 + 2/6
=59/6
b,-1 + (-3)^3 - l 1 - 1/5 l
= -1 + (-27) - l 5/5 - 1/5 l
= -28 - l 4/5l
= -28 - (-4/5)
= -28 + 4/5
=-144/5
Bài 5 :
a, (1 1/2 - 5/3 ) - (1/2 - 1 1/3 )
= 3/2 - 1/2 - (5/3 + 4/3 )
= 2/ 2 - 9/3
= 1 - 3
= -2
[ Áp dụng tính chất hoán đổi và đổi dấu ]
b, 7/4 - (-1)/2 -(-1/4) - 1/2
= 7/4 + 1/2 + 1/4 - 1/2
=( 7/4 + 1/4) + (1/2 - 1/2)
= 8/4 + 0
= 2
c, -7/3 . 5/6 + -7/3 . 9/6 + -7/3 . 9/6
= -7/3 . (5/6 + 9/6 + 4/6 )
= -7/3 . 18/6
= -7/3 . 3
= -21 / 3
=-7
a, 1/2 - (-3)^2 + 1/3
=1/2 + 3^2 + 1/3
=1/2 + 9 + 1/3
=3/6 + 54/6 + 2/6
=59/6
b,-1 + (-3)^3 - l 1 - 1/5 l
= -1 + (-27) - l 5/5 - 1/5 l
= -28 - l 4/5l
= -28 - (-4/5)
= -28 + 4/5
=-144/5
Bài 5 :
a, (1 1/2 - 5/3 ) - (1/2 - 1 1/3 )
= 3/2 - 1/2 - (5/3 + 4/3 )
= 2/ 2 - 9/3
= 1 - 3
= -2
b, 7/4 - (-1)/2 -(-1/4) - 1/2
= 7/4 + 1/2 + 1/4 - 1/2
=( 7/4 + 1/4) + (1/2 - 1/2)
= 8/4 + 0
= 2
c, -7/3 . 5/6 + -7/3 . 9/6 + -7/3 . 9/6
= -7/3 . (5/6 + 9/6 + 4/6 )
= -7/3 . 18/6
= -7/3 . 3
= -21 / 3
=-7
