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2/5 + 11/15 = 17/15
7/8 - 7/9 = 7/72
11/13 x 26/31 = 22/31
16/24 : 4 = 1/6
30 : 6/5 = 25
9/16 : 4 = 9/64
1/2 : 1/3 x 8/15 = 3/2 x 8/15 = 4/5
a x * 4 + [1/2 + 1/4 + 1/8 + 1/6] = 23/16
x * 4 + 25/24 = 23/16
x * 4 = 23/16 - 25/24
x * 4 = 38/96 = 19/48
x = 19/48 / 4
x = 19/172
b x * 1 = 425
x = 425 / 1
x = 425
Nhưng Azure phan bảo linh ơi, mình cần cả bài giải cơ nếu bạn ghi hẳn bài giải ra thì mình sẽ k cho nhé
=>(x+x+x+x)+(1/2+1/4+1/8+1/16)=1
=>4x+15/16=1
=>4x=1-15/16=1/16
=>x=1/16:4
=>x=1/64
Xx4+(1/2+1/4+1/8+1/16)=23/16
Xx4=23/16-(1/2+1/4+1/8+1/16)
Xx4=1/2
X=1/2:4
X=1/8
a) \(\frac{3}{16}+\frac{4}{15}+\frac{5}{16}+\frac{1}{15}\)
\(=\left(\frac{3}{16}+\frac{5}{16}\right)+\left(\frac{4}{15}+\frac{1}{15}\right)\)
\(=\frac{1}{2}+\frac{1}{3}\)
\(=\frac{5}{6}\)
b) \(\frac{6}{7}\times\frac{8}{15}\times\frac{7}{6}\times\frac{15}{16}\)
\(=\left(\frac{6}{7}\times\frac{7}{6}\right)\times\left(\frac{8}{15}\times\frac{15}{16}\right)\)
\(=1\times\frac{1}{2}=\frac{1}{2}\)
c) \(\frac{19}{20}\times\frac{13}{21}+\frac{9}{20}\times\frac{8}{21}\)
\(=\frac{19\times13}{20\times21}+\frac{9\times8}{20\times21}\)
\(=\frac{247}{420}+\frac{72}{420}\)
\(=\frac{319}{420}\)
\(\left(x+\dfrac{1}{2}\right)+\left(x+\dfrac{1}{4}\right)+\left(x+\dfrac{1}{8}\right)+\left(x+\dfrac{1}{16}\right)=\dfrac{31}{16}\\ x+\dfrac{1}{2}+x+\dfrac{1}{4}+x+\dfrac{1}{8}+x+\dfrac{1}{16}=\dfrac{31}{16}\\ \left(x+x+x+x\right)+\left(\dfrac{1}{2}+\dfrac{1}{4}+\dfrac{1}{8}+\dfrac{1}{16}\right)=\dfrac{31}{16}\\ x\times\left(1+1+1+1\right)+\left(\dfrac{8}{16}+\dfrac{4}{16}+\dfrac{2}{16}+\dfrac{1}{16}\right)=\dfrac{31}{16}\\ x\times4+\dfrac{15}{16}=\dfrac{31}{16}\\ x\times4=\dfrac{31}{16}-\dfrac{15}{16}\\ x\times4=\dfrac{16}{16}\\ x\times4=1\\ x=1:4\\ x=\dfrac{1}{4}\)
Ai nhanh nhất mình đúng cho