Toán Lớp 7: Tính : (-3/7 + 3/5) : 20/21 + (-4/7 + 2/5) : 20/21
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Toán Lớp 7: Tính : (-3/7 + 3/5) : 20/21 + (-4/7 + 2/5) : 20/21
Comments ( 2 )
( – 3/7 + 3/5 ) : 20/21 + ( – 4/7 + 2/5 ) : 20/21
= 20/21 : 6/35 + ( -6/35 ) : 20/21
= 20/21 : ( 6/35 + 1/35 )
= 20/21 : 0
= 0
·Tyra Ming·
(- 3/7+3/5):20/21+(-4/7+2/5):20/21
=6/35:20/21+(-6/35):20/21
=[6/35+(-6/35)]:20/21
=0:20/21
=0
$\text{@Bulletproof.Boy.Scout}$