tính nhanh: a) 138 + ( 83 - 69 ) b) 138 - ( 38+ 89 ) c) 108 - ( 92 - 78 ) d) ( 9+7) x 6 e) ( 1+ 3+ 5+ 7+9) - ( 0+2+4+6+8) j) 12x 20 x 5 g) 2x3x4x5 h) 125x72x4 i) 50x 12 x7

diep2003

2 năm trước

Loga Sinh Học lớp 12

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thanhha21032010

`a)138+(83-69)`

`=138+14`

`=152`

`b)138-(38+89)`

`=138-38-89`

`=100-89`

`=11`

`c)108-(92-78)`

`=108-92+78`

`=16+78`

`=94`

`d)(9+7)×6`

`=13×6`

`=78`

`e)(1+3+5+7+9)-(0+2+4+6+8)`

`=[(1+9)+(3+7)+5]-[(2+8)+(4+6)]`

`=25-20`

`=5`

`j)12×20×5`

`=(20×5)×12`

`=100×12`

`=1200`

`g)2×3×4×5`

`=(2×5)×3×4`

`=10×3×4`

`=10×12`

`=120`

`h)125×72×4`

`=(125×4)×72`

`=500×72`

`=36000`

`i)50×12×7`

`=(50×12)×7`

`=600×7`

`=4200`

Vote (0) Phản hồi (0) 2 năm trước

nguyenthamtham

$a) 138 + (83 - 69)$

$= 138 + 14$

$= 152$

$b) 138 - (38 + 89)$

$= 138 - 38 - 89$

$= 100 - 89$

$= 11$

$c) 108 - (92 - 78)$

$= 108 - 92 + 78$

$= 16 + 78$

$= 94$

$d) (9 + 7) \times 6$

$= 13 \times 6$

$= 78$

$e) (1 + 3 + 5 + 7 + 9) - (0 + 2 + 4 + 6 + 8)$

$= [(1 + 9) + (3 + 7) + 5] - [(2 + 8) + (4 + 6)]$

$= 25 - 20$

$= 5$

$j) 12 \times 20 \times 5$

$= (20 \times 5) \times 12$

$= 100 \times 12$

$= 1200$

$g) 2 \times 3 \times 4 \times 5$

$= (2 \times 5) \times 3 \times 4$

$= 10 \times 3 \times 4$

$= 10 \times 12$

$= 120$

$h) 125 \times 72 \times 4$

$= (125 \times 4) \times 72$

$= 500 \times 72$

$= 36000$

$i) 50 \times 12 \times 7$

$= (50 \times 12) \times 7$

$= 600 \times 7$

$= 4200$

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