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a,
23 x (7 - 4) = 23 x 3 = 69
23 x 7 - 23 x 4 = 161 - 92 = 69
Ta có: 23 x (7 - 4) = 23 x 7 - 23 x 4
b,
(8 - 3) x 9 = 5 x 9 = 45
8 x 9 - 3 x 9 = 72 - 27 = 45
Ta có: (8 - 3) x 9 = 8 x 9 - 3 x 9
a) \(x-\frac{5}{3}-\frac{1}{2}=\frac{2}{9}\)
\(x-\frac{5}{3}=\frac{2}{9}+\frac{1}{2}\)
\(x-\frac{5}{3}=\frac{13}{18}\)
\(x=\frac{13}{18}+\frac{5}{3}\)
\(x=\frac{43}{18}\)
b) \(y:\frac{7}{9}=4-\frac{23}{8}\)
\(y:\frac{7}{9}=\frac{9}{8}\)
\(y=\frac{9}{8}\times\frac{7}{9}\)
\(y=\frac{7}{8}\)
ủng hộ nha
a)
104 x 7 = 7 x 104
b)
9 x 30 = (20+10) x 9
c)
(6 x 15) x 21 = 6 x (15 x 21)
d)
23 x 3 x 4 = 4 x 69= 12 x 23
a: =>x+7/4=6:2/3=9
=>x=29/4
b: =>x:5/3=7/5
=>x=7/5*5/3=7/3
c:=>x+1/6=5/3
=>x=10/6-1/6=3/2
d: =>x+4/5=4/5+3/7+3/5
=>x=3/7+3/5=36/35
e: =>x/35=4/5-5/7=3/35
=>x=3
f: =>13/28+x=1/2
=>x=1/28
g: =>1/3-x=1/9
=>x=2/9
a, = \(\frac{11}{21}\)x \(\left(\frac{7}{4}+\frac{5}{4}\right)\)
= \(\frac{11}{21}\)x 3
= \(\frac{33}{21}\)
b) = \(\left(\frac{23}{14}-\frac{9}{14}\right)\)x \(\frac{6}{13}\)
= 1 x \(\frac{6}{13}\)
= \(\frac{6}{13}\)
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\(x\div\frac{7}{9}\)\(=4-\frac{23}{9}\)
\(x\div\frac{7}{9}\)\(=\frac{13}{9}\)
\(x=\frac{13}{9}\)\(\times\frac{7}{9}\)
\(x=\frac{91}{81}\)
x:7/9=4-23/9
x:7/9=13/9
x =13/9x7/9
x =91/81