A+B+C,biết: A=2/3+3/4-4/5 ; B=5/6-7/8+9/10 ; C=1/2+1/8-1/10 03/08/2021 Bởi Ivy A+B+C,biết: A=2/3+3/4-4/5 ; B=5/6-7/8+9/10 ; C=1/2+1/8-1/10
` A + B + C = ( 2/3 +3/4 – 4/5) + (5/6- 7/8 + 9/10) + (1/2 + 1/8 – 1/10)` ` = 2/3 + 3/4 – 4/5 + 5/6 – 7/8 + 9/10 + 1/2 +1/8 – 1/10` ` = (2/3 + 5/6+1/2) + (3/4 – 7/8 + 1/8) – (4/5 – 9/10 +1/10)` ` = ( 4/6 + 5/6 + 3/6) + ( 6/8 – 7/8 + 1/8) – (8/10 -9/10+ 1/10)` ` = 12/6 + 0 – 0 ` ` = 12/6` ` = 2` Bình luận
Đáp án:
Giải thích các bước giải:
` A + B + C = ( 2/3 +3/4 – 4/5) + (5/6- 7/8 + 9/10) + (1/2 + 1/8 – 1/10)`
` = 2/3 + 3/4 – 4/5 + 5/6 – 7/8 + 9/10 + 1/2 +1/8 – 1/10`
` = (2/3 + 5/6+1/2) + (3/4 – 7/8 + 1/8) – (4/5 – 9/10 +1/10)`
` = ( 4/6 + 5/6 + 3/6) + ( 6/8 – 7/8 + 1/8) – (8/10 -9/10+ 1/10)`
` = 12/6 + 0 – 0 `
` = 12/6`
` = 2`