Toán Lớp 6: B1 : Tính hợp lí
e. 28/45 – ( 8/45 – 17/51 – 3/11)
f. ( 11/4 – 5/9 – 4/9 × 11/4 ) × 8/13
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Toán Lớp 6: B1 : Tính hợp lí
e. 28/45 – ( 8/45 – 17/51 – 3/11)
f. ( 11/4 – 5/9 – 4/9 × 11/4 ) × 8/13
Comments ( 1 )
=28/45-8/45+17/51+3/11
=4/9+17/51+3/11
=4/9+1/3+3/11
=44/99+33/99+27/11
=(44+33+27)/11
=104/11
f) ( 11/4 – 5/9 – 4/9 × 11/4 ) × 8/13
=(11/4-5/9-11/9)*8/13
=[11/4-(5/9+11/9)]*8/13
=(11/4-16/9)*8/13
=(99/36-64/36)*8/13
=35/36*8/13
=(35*8)/(36*13)
=(35*4*2)/(4*9*13)
=(35*2)/(9*13)
=70/117