Toán Lớp 7: 23 $\frac{3}{5}$: $\frac{-5}{9}$-38 $\frac{3}{5}$: $\frac{-5}{9}$
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Toán Lớp 7: 23 $\frac{3}{5}$: $\frac{-5}{9}$-38 $\frac{3}{5}$: $\frac{-5}{9}$
Comments ( 2 )
23 3/5 : (-5)/9 – 38 3/5 : (-5)/9
=118/5 : (-5)/9 – 193/5 : (-5)/9
=- 118/5 * 9/5 + 193/5 * 9/5
=- 1062/25 + 1737/25
=27
Cách làm:
B1: Biến đổi các biểu thức
B2: Chia
B3: Nhân
B4: Tính
…
23 3/5 : (- 5/9 ) – 38 3/5 : (- 5/9 )
= 23 3/5. (- 9/5 ) – 38 3/5. (- 9/5 )
= (- 9/5 ). ( 23 3/5 – 38 3/5 )
= (- 9/5 ). ( -15 )
= 27