Bài 29 : Tính
a, 2 x 3 x 8 / 4 x 5 x 6 x 7 b, 36 x 22 x 51 / 11 x 17 x 72
Bài 29 : Tính a, 2 x 3 x 8 / 4 x 5 x 6 x 7 b, 36 x 22 x 51 / 11 x 17 x 72
By Anna
By Anna
Bài 29 : Tính
a, 2 x 3 x 8 / 4 x 5 x 6 x 7 b, 36 x 22 x 51 / 11 x 17 x 72
Bài 29
a: 2 x 3 x 8 / 4 x 5 x 6 x 7
= 2 x 3 x 4 x 2 / 4 x 5 x 6 x 7
= 2 / 5 x 7
= 2/35
b: 36 x 22 x 51 / 11 x 17 x 72
= 792 x 51 / 187 x 72
= 40392 / 13464
= 3
a, `{2× 3 ×8}/{4 × 5 × 6 × 7}`
=`{2×3×4×2}/{4×5×2×3×7}`
=`2/{5×7}`
=`2/35`
b, `{36 × 22 × 51}/{11 × 17 × 72}`
=`{36×2×11×3×17}/{11×17×36×2}`
=`3`