Sagot :
bjr
a. 54 x 46
54 x 46 = (50 + 4)(50 - 4) [ (a + b)(a - b) = a² - b²) ]
= 50² - 4²
= 2500 - 16
= 2484
b. 103 x 97
103 x 97 = (100 + 3)(100 - 3)
= 100² - 3²
= 10 000 - 9
= 9991
bjr
a. 54 x 46
54 x 46 = (50 + 4)(50 - 4) [ (a + b)(a - b) = a² - b²) ]
= 50² - 4²
= 2500 - 16
= 2484
b. 103 x 97
103 x 97 = (100 + 3)(100 - 3)
= 100² - 3²
= 10 000 - 9
= 9991