12x15 x17|6x34x45 lớp 4

2 câu trả lời

`(12 xx 15 xx 17)/( 6 xx 34 xx 45)`

`= ( 2 xx 6 xx 15 xx 17)/( 6 xx 2 xx 17 xx 15 xx 3 )`

`= 1/3`

`(12 × 15 × 17)/( 6 × 34 × 45)`

`= ( 2  × 6  × 15  × 17 )/( 6  × 2  × 17  × 15  × 3 )`

 `= (  cancel{2} × cancel{6}  ×  cancel{15} × cancel{17} )/( cancel{6} × cancel{2} × cancel{17} × cancel{15} × 3)`

`= 1/3`