Question

Tính bằng cách thuận tiện  nhất :

a) 21 / 11 * 22/ 17 * 68/63 ; b ) 5 /14 * 7 / 13 * 26 /25

Các bn ơi giúp mk nha ! ^-^

Answer 1

a ) 21/11 * 22/ 17 *68 / 63 = 42 /17 * 68 / 63 = 8 / 3

b) 5 / 14 * 7 / 13 * 26 / 25 = 5/ 26 * 26 / 25 = 1/ 5

Answer 2

Bố con ngố

Answer 3

Đ là bài phân số à bn !? 

Answer 4

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Answer 5

Đậu xanh