Question

Câu 1(2,0 điểm): Tính hợp lí:

a) 21.7² - 11.7² + 90.7² + 49.125.16

Answer 1

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Mik hứa tick cho mn...

Answer 2

a,21.7^2-11.7^2+90.7^2+49.125.16

=7^2.(21-11+90)+49.(2.125.8)

=49.100+49.2000

=49.(100+2000)

=49.2100

=102900

Answer 3

Thanks!!!!