Question

grupeaza convenabil factorii,pentru a calcula mai usor produsele 2.6.5=,2.6.2=,7.2.3=,4.5.2=,4.5.2

Answer 1

2 × 6 × 5 = 6 × ( 2 × 5 ) = 6 × 10 = 60

2 × 6 × 2 = ( 2 × 2 ) × 6 = 4 × 6 = 24

7 × 2 × 3 = 7 × ( 2 × 3 ) = 7 × 6 = 42

4 × 5 × 2 = 4 × ( 5 × 2 ) = 4 × 10 = 40

sau:   4 × 5 × 2 = ( 4 × 2 ) × 5 = 8 × 5 = 40

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