3/11 x 7/19 + 3/11 x 17/19 - 3/11 x 24/19
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A, 7x - x = 5^21 : 5^19 + 3 . 2^2 - 7^0
6x = 5^2 + 3 . 4 - 1
6x = 25 + 12 - 1
6x = 37 - 1
6x = 36
x = 6.
B, mình giải ra nhưng số to quá. Bạn thử kiểm tra lại đề xem.
C, 7x - 2x = 6^17 : 6^15 + 44 : 11
5x = 6^2 + 4
5x = 40
x = 8.
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=43/306:599/105x1473/1820
=1505/61098x1473/1820
=0.01993613035
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\(A=\frac{7}{19}.\frac{8}{11}.\frac{7}{19}:\frac{3}{11}+\frac{12}{19}\)
\(A=\left(\frac{7}{19}\right)^2.\frac{8}{11}.\frac{11}{3}+\frac{12}{19}\)
\(\Rightarrow A=\left(\frac{7}{19}\right)^2.\frac{8}{3}+\frac{12}{19}\)
\(\Rightarrow A=\frac{392}{1083}+\frac{12}{19}\)
\(\Rightarrow A=\frac{1076}{1083}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(A=\frac{56}{209}x\frac{7}{19}:\frac{3}{11}+\frac{12}{19}\)
\(A=\frac{392}{3971}:\frac{3}{11}+\frac{12}{19}\)
\(A=\frac{392}{1083}+\frac{12}{19}\)
\(A=\frac{1076}{1083}\)
3/11x7/19+3/11x17/19-3/11x24/19
=3/11x(7/19+17/19-24/19)
=3/11x0
=0
Bài làm
\(\frac{3}{11}\times\frac{7}{19}+\frac{3}{11}\times\frac{17}{19}-\frac{3}{11}\times\frac{24}{19}\)
\(=\frac{3}{11}\times\left(\frac{7}{19}+\frac{17}{19}-\frac{24}{19}\right)\)
\(=\frac{3}{11}\times\frac{0}{19}\)
\(=\frac{3}{11}\times0\)
\(=0\)
# Học tốt #