Question

tính

a) 2x3x8/4x5x6x7

b) 36x22x51/11x17x72

Answer 1

a) (2 × 3 × 8)/(4 × 5 × 6 × 7)

= (6 × 2 × 4)/(4 × 5 × 6 × 7)

= 2/(5 × 7)

= 2/35

b) (36 × 22 × 51)/(11 × 17 × 72)

= (36 × 2 × 11 × 3 × 17)/(11 × 17 × 2 × 36)

= 3

Answer 2

Lời giải:
a.

\(\frac{2\times 3\times 8}{4\times 5\times 6\times 7}=\frac{2\times 24}{24\times 5\times 7}=\frac{2}{5\times 7}=\frac{2}{35}\)

b.

\(\frac{36\times 22\times 51}{11\times 17\times 72}=\frac{36\times 2\times 11\times 17\times 3}{11\times 17\times 72}=\frac{72\times 11\times 17\times 3}{11\times 17\times 72}=3\)

Answer 3

b.

Answer 4

\(a.\dfrac{2\times3\times8}{4\times5\times6\times7}=\dfrac{2\times3\times4\times2}{2\times2\times5\times2\times3\times7}=\dfrac{2}{5\times7}=\dfrac{2}{35}\)

\(b.\dfrac{36\times22\times51}{11\times17\times72}=\dfrac{36\times2\times11\times3\times17}{11\times17\times2\times36}=3\)