Giúp mình dí : A) 3/8 + 1/4 – 5/12 B) -1/8 +-5/3 D)-7/8×-56/49 Ghii cách làm ra hộ ạ 26/09/2021 Bởi Kennedy Giúp mình dí : A) 3/8 + 1/4 – 5/12 B) -1/8 +-5/3 D)-7/8×-56/49 Ghii cách làm ra hộ ạ
A) Quy đồng mẫu số chung 48 $\frac{3}{8}$ +$\frac{1}{4}$- $\frac{5}{12}$ = $\frac{18}{48}$ + $\frac{12}{48}$ – $\frac{20}{48}$ = $\frac{18+12- 20}{48}$ = $\frac{10}{48}$ = $\frac{5}{24}$ B) Quy đồng mẫu số chúng 24 $\frac{-1}{8}$ + $\frac{-5}{3}$ = $\frac{-1}{8}$ – $\frac{5}{3}$ = $\frac{-3}{24}$ – $\frac{40}{24}$ = $\frac{-3- 40}{24}$ = $\frac{-43}{24}$ C) Tách $\frac{-56}{49}$= $\frac{-8}{7}$ x $\frac{7}{7}$ $\frac{-7}{8}$ x $\frac{-56}{49}$ = $\frac{-7}{8}$ x $\frac{-8}{7}$ x $\frac{7}{7}$ = $\frac{7}{7}$ =1 Bình luận
A) 3/8 + 1/4 – 5/12 =3/8+2/8-5/12 =5/8-5/12 =15/24-10/24 =5/24 B) -1/8 +-5/3 =-3/24+-40/24 = -43/24 C)-7/8×-56/49 = 1 Bình luận
A) Quy đồng mẫu số chung 48
$\frac{3}{8}$ +$\frac{1}{4}$- $\frac{5}{12}$
= $\frac{18}{48}$ + $\frac{12}{48}$ – $\frac{20}{48}$
= $\frac{18+12- 20}{48}$
= $\frac{10}{48}$ = $\frac{5}{24}$
B) Quy đồng mẫu số chúng 24
$\frac{-1}{8}$ + $\frac{-5}{3}$
= $\frac{-1}{8}$ – $\frac{5}{3}$
= $\frac{-3}{24}$ – $\frac{40}{24}$
= $\frac{-3- 40}{24}$
= $\frac{-43}{24}$
C) Tách $\frac{-56}{49}$= $\frac{-8}{7}$ x $\frac{7}{7}$
$\frac{-7}{8}$ x $\frac{-56}{49}$
= $\frac{-7}{8}$ x $\frac{-8}{7}$ x $\frac{7}{7}$
= $\frac{7}{7}$ =1
A) 3/8 + 1/4 – 5/12
=3/8+2/8-5/12
=5/8-5/12
=15/24-10/24
=5/24
B) -1/8 +-5/3
=-3/24+-40/24
= -43/24
C)-7/8×-56/49
= 1