的绝对值产品的是一样的绝对值的乘积.例如:
| ( 9 ) ( − 3. ) | = | 9 | | − 3. | = ( 9 ) ( 3. ) = 27
| ( − 11 ) ( − 10 ) | = | − 11 | | − 10 | = ( 11 ) ( 10 ) = 110
| x 3. y | = | x 3. | | y |
同样的道理商.
| ( 10 ) ( − 5 ) | = | 10 | | − 5 | = 10 5 = 2
然而,加法和减法并不总是这样!
| − 3. + 7 | = | 4 | = 4 , 但
| − 3. | + | 7 | = 3. + 7 = 10
所以要小心!