Question

tính nhanh :

a) 58 x 2 + 58 + 58 x 7

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b) 8543 - 2541 - 4459 + 1457

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Answer 1

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Answer 2

a) 58 x 2 + 58 + 58 x 7

...=58x (2 + 1 + 7).............................................................................

.....= 58 x 10 = 580...........................................................................

b) 8543 - 2541 - 4459 + 1457

= (8543 + 1457) - ( 2541 + .4459................................................................................

...= 10000 - 7000 = 3000..............................................................................