Đỗ Nguyễn Hương Ly
Giới thiệu về bản thân
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2022-05-05 21:26:55
a. 1/2 . 4/3- 20/3.4/5
= 1.4/2.3 - 20.4/3.5
= 1.2.2/2.3 - 4.5.4/3.5
= 2/3-16/3
=-14/3
b. 3/7+-6/19+4/7+-13/19
= (3/7 + 4/7) + (6/19 + 13/19)
= 1+ 1
= 2
c. 3/5.8/9-7/9.3/5+3/5.26/9
= 3/5. ( 8/9 - 7/9 +26/9)
= 3/5 . 3
= 9/5
