B 3/7+ 4/8 = ?
Tính roi rut gon:
A).2/7:4/5 b).3/8:9/4 c).8/21:4/7
D).5/8:15/8
Ai lam day du phep tinh va cach rug gon mik tick 2 cai lan
A)2/7:4/5=2/7*5/4=10/28=5/14
b)3/8:9/4=3/8*4/9=12/72=1/6
c)8/21:4/7=8/21*7/4=56/84=2/3
D)5/8:15/8=5/8*8/15=40/120=1/3
k nha
Rut gon roi tinh (122/42.62-153/252.62-82.92/43.64):(125/175-48/84)
Tinh roi rut gon (theo mau)
a,1/8 + 5/8 b,5/9 + 7/9
\(a,\frac{1}{8}+\frac{5}{8}=\frac{1+5}{8}=\frac{6}{8}=\frac{6:2}{8:2}=\frac{3}{4}\)
\(b,\frac{5}{9}+\frac{7}{9}=\frac{5+7}{9}=\frac{12}{9}=\frac{12:3}{9:3}=\frac{4}{3}\)
cho phan so a/b . Neu rut gon phan so a/b thi ta duoc phan so 3/4 . Neu cong them 15 don vi vao tu so roi rut gon thi duoc phan so 7/6. Tim phan so a/b
rut gon roi tinh :(123.52/42.92.25-153.42/64.75)(48/84-4/3)
Rut gon roi tinh: ( \(\frac{12^2}{4^2.6^2}\) - \(\frac{15^3}{25^2.6^2}\) - \(\frac{8^2.9^2}{4^3.6^4}\) )
rut gon roi tinh:
28/35*15/72*1 va 7/49.
miru
Rút gọn rồi tính:
\(\frac{28}{35}.\frac{15}{72}.1\frac{7}{49}\)
\(=\frac{4}{5}.\frac{5}{24}.\frac{56}{49}\)
\(=\frac{4.5.8}{5.24.7}=\frac{4}{21}\)
\(\frac{28}{35}.\frac{15}{72}.1\frac{7}{49}\)
\(=\frac{4}{5}.\frac{5}{24}.\frac{7}{49}\)
\(=\frac{4}{21}\)
k mk nha, cảm ơn những người đã k
rut gon 1*2*5+3*3*15+4*8*20+7*14*350/2*5*11+6*10+33+8*20*44+14*35*770
rut gon roi tinh 36 phần 16 trừ 10 phàn 8 bang bao nhieu ?
\(\frac{36}{16}-\frac{10}{8}=\frac{9}{4}-\frac{5}{4}=1\)
@muối