Toán Lớp 6: Câu 1
5/9.7/13+5/9.9/13+5/9.3/13
Câu 2
5/9+8/15+(-2)/11+4/-9+7/15
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Toán Lớp 6: Câu 1
5/9.7/13+5/9.9/13+5/9.3/13
Câu 2
5/9+8/15+(-2)/11+4/-9+7/15
Giúp mình với
Comments ( 2 )
Câu 1 . =95/117
Câu 2 . =92/99
5/9. 7/13+5/9. 9/13+5/9 . 3/13
=5/9.(7/13+9/13+3/13)
=5/9.(19/13)
=95/117
Câu 2.
5/9+8/15+(-2)/11+4/-9+7/15
=(5/9-4/9)+(8/15+7/15)-2/11
=1/9+15/15-2/11
=1/9+1-2/11
=1/9+9/9-2/11
=10/9-2/11
=110/99-18/99
=92/99
5/9+8/15+(-2)/11+4/-9+7/15