Toán Lớp 5: A
3/13+2/5+8/13+8/15
B
3/5×5/7+17/10×5/7
C
5/9×12/13+12/13×5/18+1/6×12/13
D
6/7×8/8-8/9×5/14
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Toán Lớp 5: A
3/13+2/5+8/13+8/15
B
3/5×5/7+17/10×5/7
C
5/9×12/13+12/13×5/18+1/6×12/13
D
6/7×8/8-8/9×5/14
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Comments ( 2 )
=(3/13+8/13)+(2/5+8/15)
=11/13+(6/15+8/15)
=11/13+14/15
=347/195
B=3/5xx5/7+17/10xx5/7
=5/7xx(3/5+17/10)
=5/7xx(6/10+17/10)
=5/7xx23/10
=23/14
C=5/9xx12/13+12/13xx5/18+1/6xx12/13
=12/13xx(5/9+5/18+1/6)
=12/13xx(10/18+5/18+3/18)
=12/13xx1
=12/13
D=6/7xx8/8-8/9xx5/14
=6/7-20/63
=34/63