Question

tính bằng cách thuận tiện nhất:

a)6.7 x 9.55 + 9.45 x 16.7 + 16.7

b)3/4 x 4/5 + 5/6 x 6/7 x 7/8

Answer 1

a)16.7 x 9.55 + 9.45 x 16.7 + 16.7

=16.7 x (9.45 + 9.55 + 1)

=16.7 x 20=334

b) 3/4 x 4/5 x 5/6 x 6/7 x 7/8

=3/5 x 5/6 x 6/8 (rút gọn)

=3/5 x 5/8

=3/8

Answer 2

6,7 x9.55  +9.,45 x 16,7 +16,7

=16,7 x ( 9,45 + 9,55 +1)

=16,7x 20 =334

cau kia de tu lam

Answer 3

16,7 x (9,55 + 9,45 +1) 

=16,7 x20 =334

nếu sai sửa giúp mình nhé

Answer 4

1 o dau vay

Answer 5

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