Toán Lớp 7: a: 1/3 . 3/5 + 4/5 . 1/3 + 1/3 . 8/5
b: |-0,75| + 1/4 – 2 1/2
Giúp mik vs
(/= phần)
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Toán Lớp 7: a: 1/3 . 3/5 + 4/5 . 1/3 + 1/3 . 8/5
b: |-0,75| + 1/4 – 2 1/2
Giúp mik vs
(/= phần)
Comments ( 2 )
a)
1/3 . 3/5+4/5 . 1/3+1/3 . 8/5
=1/3 . (3/5+4/5+8/5)
=1/3 . 15/5
=1/3 . 3
=3/3=1
b)
|-0,75|+1/4 -2 1/2
=3/4+1/4-2 1/2
=1-2 1/2
=1-5/2
=2/2-5/2
=-3/2
a) 1/3 . 3/5 + 4/5 . 1/3 + 1/3 . 8/5 = 1/3 . (3/5 + 8/5 + 4/5)
= 1/3 . 3
= 1
b) |-0,75| + 1/4 – 2 1/2
= 3/4 + 1/4 – 5/2
= 1 – 5/2 = -3/2