Toán Lớp 6: Mấy bợn ơi , giúp mik bài này , do có nhìu pài qá nên mik nhát tính ý 3) 287 + 121 + 513 + 79 4) 17.34 + 17.39 + 2

0 bình luận về “Toán Lớp 6: Mấy bợn ơi , giúp mik bài này , do có nhìu pài qá nên mik nhát tính ý 3) 287 + 121 + 513 + 79 4) 17.34 + 17.39 + 2”

1. 3,

   287+121+513+79

   =(287+513)+(121+79)

   =800+200

   =1000

   4,

   17.34+17.39+27.17

   =17.(34+29+27)

   =17.(63+27)

   =17.100

   =1700

   5,

   4.52-64:42

   =208-1,52

   =206,48

   6,

   25.101-25.1010

   =25.(101-1010)

   =25.(-909)

   =-22725

   7,

   72+[62-(102-4.16)]

   =72+[62-(102-64)]

   =72+[62-58]

   =72+4

   =76

   9,

   [120:4-(23-17).5].20212022

   =(30-6.5).20212022

   =(30-30).20212022

   =0.20212022

   =0

2. $\text{3/ 287 + 121 + 513 + 79}$ $\\$ $\text{= (287 + 513) + (121 + 79)}$ $\\$ $\text{= 1000 + 200}$ $\\$ $\text{= 1200}$ $\\$ $\text{4/ 17.34 + 17.39 + 27.17}$ $\\$ $\text{= 17. (34 + 39 + 27)}$ $\\$ $\text{= 17. 100}$ $\\$ $\text{= 1700}$ $\\$ $\text{5/ 4. 52 − 64 : 42}$ $\\$ $\text{= 208 − 1,52}$ $\\$ $\text{= 206,48}$ $\\$ $\text{6/ 25 . 101 – 25 .1010}$ $\\$ $\text{= 25. (101 – 1010)}$ $\\$ $\text{= 25. (-909)}$ $\\$ $\text{= -22725}$ $\\$ $\text{7/ 72 + [62 – ( 102 – 4 . 16 )]}$ $\\$ $\text{= 72 + [62 – (102 – 64)]}$ $\\$ $\text{= 72 + (62 – 38)}$ $\\$ $\text{= 72 + 24}$ $\\$ $\text{= 96}$