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2795
2709
Bài `11:`
`a)(1/4+3/4+2/8)+(-5/13+(-8)/13)`
`=1+2/8-1`
`=2/8`
`b)(-7)/31+24/19+1/15+7/31+(-5)/19`
`=((-7)/31+7/31)+(24/19+(-5)/19)+1/15`
`=0+1+1/15`
`=15/15+1/15`
`=16/15`
`c)(-46)/43+5/17+11/17+3/43+1/17`
`=((-46)/43+3/43)+(5/17+11/17+1/17)`
`=-1+1`
`=0`
`d)(21/31+(-16)/7)+(44/53+10/31)+9/53`
`=21/31+(-16)/7+44/53+10/31+9/53`
`=(21/31+10/31)+(44/53+9/53)+(-16)/7`
`=1+1-16/7`
`=2-16/7`
`=14/7-16/7`
`=-2/7`
`e)(15/16+13/33+1/11)+(7/33+(-15)/16+20/66)`
`=15/16+13/33+3/33+7/33+(-15)/16+10/33`
`=(15/16+(-15)/16)+(13/33+3/33+7/33+10/33)`
`=-1+1`
`=0`
Hãy giúp mọi người biết câu trả lời này thế nào?
2741
2612
Đáp án:
`(1/4+3/4+2/8)+(-5/13+(-8)/13)`
`=1+2/8-1`
`=2/8`
____________________________________________________
`(-7)/31+24/19+1/15+7/31+(-5)/19`
`=((-7)/31+7/31)+(24/19+(-5)/19)+1/15`
`=0+1+1/15`
`=15/15+1/15`
`=16/15`
____________________________________________________
`(-46)/43+5/17+11/17+3/43+1/17`
`=((-46)/43+3/43)+(5/17+11/17+1/17)`
`=-1+1`
`=0`
____________________________________________________
`(21/31+(-16)/7)+(44/53+10/31)+9/53`
`=21/31+(-16)/7+44/53+10/31+9/53`
`=(21/31+10/31)+(44/53+9/53)+(-16)/7`
`=1+1-16/7`
`=2-16/7`
`=14/7-16/7`
`=-2/7`
____________________________________________________
`(15/16+13/33+1/11)+(7/33+(-15)/16+20/66)`
`=15/16+13/33+3/33+7/33+(-15)/16+10/33`
`=(15/16+(-15)/16)+(13/33+3/33+7/33+10/33)`
`=-1+1`
`=0`
Hãy giúp mọi người biết câu trả lời này thế nào?
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