Bài 1 A ) 2 + 5/6 + 7/12 B) 3/5 + 6 + 9/15 C) 21/27 + 9 + 12/3 D) 5/6 + 7/12 + 2 Bài 2 A)2/ 12 + 5 + 10/12 B) 16 / 20 + 7/20 + 13 C) 7/12 + 14/21 + 9

0 bình luận về “Bài 1 A ) 2 + 5/6 + 7/12 B) 3/5 + 6 + 9/15 C) 21/27 + 9 + 12/3 D) 5/6 + 7/12 + 2 Bài 2 A)2/ 12 + 5 + 10/12 B) 16 / 20 + 7/20 + 13 C) 7/12 + 14/21 + 9”

1. bài 1:a 2+ 5/6 + 7/12= 2/1+ 5/6 + 7/12= 24/12+10/12+7/12=41/12

   b 3/5+6 + 9/15=3/5+6/1+9/15=9/15+90/15+9/15=108/15

   c 21/27+9 + 12/3= 21/27+ 9/1+12/3= 21/27+252/27+108/27=381/27

   d5/6+7/12+2=5/6+7/12+2/1= 10/12+ 7/12+24/12=41/12

   bài 2: a 2/12 + 5 + 10/12= 2/12+5/1+10/12=2/12+60/12+10/12=72/12

   b 16/20+7/20+13=16/20+7/20=13/1=16/20+7/20+260/20=283/20

   c7/12+14/21+9=7/12+14/21+9/1=49/84+56/84+756/84=861/84

   d 25/30+7+5/30=(25/30+5/30)+7= 1+7=8

   Đủ nha hơi lâu chút :vvv

    

    

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2. BÀI 1:

   A)2+5/6+7/12(MSC:12)

    =24/12+10/12+7/12

   =24+10+7/12

   =41/12

   B)3/5 +5/6+9/15(MSC:30)

   =18/30 +25/30 +18/30

   =18+25+18/30

   =61/30

   C)21/27+9+12/3(MSC:27)

   =21/27+243/27+108/27

   =21+243 +108/27

   =124/9

   D)5/6 +7/12+2(MSC:121)

   =10/12+7/12+24/12

   =10+7+24/12

   =41/12

   Bài 2:

   A)2/12+5+10/12(MSC:12)

   =2/12+60/12+10/12

   =2+60+10/12

   =6

   B)16/20+7/20+13(MSC:20)

   =16/20+7/20+260/20

   =16+7+260/20

   =283/20

   C)7/12+4/41+10/12(MSC:492)

   =287/492+48/492+410/492

   =287+48+410/492

   =745/492

   D)25/30+7+5/30(MSC:30)

   =25/30+210/30+5/30

   =25+210+5/30

   =240/30

   =8

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