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30,17 * 37,8 + 20,17 * 61,2 + 20 + 0,17
=3,017 * 378 + 2,017 * 612 + 20,17
=3,017 - 1 * 378 + 2,017 * 612 + 20,17 - 18
=78tyj
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Dùng tính chất phân phối. Ta có:
(9 + a) x a = 9 x a + a x a = a x a + 9 x a
(9 + a) x 8 = 9 x 8 + a x 8 = a x 8 + 72
=> (9 + a) x a - (9 + a) x 8 = a x a + 9 x a - (a x 8 + 72) = a x a + 9 x a - a x 8 - 72
\(a,x+\frac{3}{8}=\frac{4}{3}\)
\(x=\frac{4}{3}-\frac{3}{8}\)
\(x=\frac{23}{24}\)
\(b,x-\frac{1}{9}=\frac{7}{6}\)
\(x=\frac{7}{6}+\frac{1}{9}\)
\(x=\frac{23}{18}\)
\(c,x\times\frac{1}{9}=\frac{21}{8}\)
\(x=\frac{21}{8}:\frac{1}{9}\)
\(x=\frac{189}{8}\)
\(d,x:\frac{8}{3}=5\)
\(x=5\times\frac{8}{3}\)
\(x=\frac{40}{3}\)
a) 3 x X x 2/3 = 4/5
3.x=6/5
x=2/5
b) 3,94 x 18,24 + 18,24 x 3,72 + 18,24 x 2,34
=18,24(3,94+3,72+2,34)
=18,24.10
=182,4
d) 8/19 x 2/7 + 8/19 x 1/7 + 8/19 x 4/7
=8/19(2/7+1/7+4/7)
=8/19.1
=8/19
`!`
\(a,\dfrac{8}{9}\times\dfrac{7}{5}-\dfrac{7}{9}\times\dfrac{2}{5}+\dfrac{2}{9}\\ =\dfrac{8}{9}\times\left(\dfrac{7}{5}-\dfrac{2}{5}\right)+\dfrac{2}{9}\\ =\dfrac{8}{9}\times\dfrac{5}{5}+\dfrac{2}{9}\\ =\dfrac{8}{9}+\dfrac{2}{9}\\ =\dfrac{10}{9}\)
\(b,\dfrac{5}{9}\times\dfrac{1}{4}+\dfrac{4}{9}\times\dfrac{3}{12}\\ =\dfrac{5}{9}\times\dfrac{1}{4}+\dfrac{4}{9}\times\dfrac{1}{4}\\ =\dfrac{1}{4}\times\left(\dfrac{5}{9}+\dfrac{4}{9}\right)\\ =\dfrac{1}{4}\times\dfrac{9}{9}\\ =\dfrac{1}{4}\)
\(\frac{7}{9}.\frac{8}{17}+\frac{15}{9}-\frac{7}{9}.\frac{6}{12}=\frac{56}{153}+\frac{15}{9}-\frac{7}{18}=\frac{503}{306}\)
ủng hộ nha
a) 2 x 2 x 2 x ... x 2 x 2 :2
b) 3 x 3 x 3 x ... x 3 x 3 :3
c) 4 x 4 x 4 x ... x 4 x 4 :4
d) 5 x 5 x 5 x ... x 5 x 5 :5
e) 6 x 6 x 6 x ... x 6 x 6 :6
g) 7 x 7 x 7 x...x 7 x 7 :7
h) 8 x 8 x 8 x... x 8 x 8 :8
i) 9 x 9 x 9 x...x 9 x 9 :9
a x 8 + a x 9 = 61,2
a x 17 = 61,2
a = 61,2 : 17
a = 3,6 Tk mk,mk tk lại !!!!!
a x 8 + a x 9 = 61,2
a = 61,2 : ( 8 + 9 )
a = 61,2 : 17
a = 3,6