45:3=
21x9=
5x6+5x3+5=
9x9:3=
nhớ tick cho mình nhé
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bảng nhân 5 mà , sao lại ghi vào định muốn bị olm trừ điểm hả ? Ủng hộ và kết bn vs mik đi cho đỡ chán
1,
a, \(x\)x 124= 4829-365
\(x\)x 124 = 4464
\(x\)= 4464 :124
\(x\)= 36.
b,\(x\)x 137 = 25 x 3
\(x\)x 137 = 75
\(x\)= \(\frac{75}{137}\)
2,
\(\frac{4}{5}\)x\(\frac{3}{7}+\frac{4}{5}\)x\(\frac{6}{7}-\frac{4}{5}\)x\(\frac{4}{10}\)
=\(\frac{4}{5}\)x\(\left(\frac{3}{7}+\frac{6}{7}-\frac{4}{10}\right)\)=\(\frac{4}{5}\)x\(\frac{31}{35}\)\(\frac{124}{175}\)
\(\text{Bài }1\text{ : Tìm }x\text{ : }\)
\(a,\text{ }x\text{ x }124=4829-365\)
\(x\text{ x }124=4464\)
\(x=4464\text{ : }124\)
\(x=36\)
\(b,\text{ }x\text{ x }137=25\text{ x }3\)
\(x\text{ x }137=75\)
\(x=75\text{ : }137\)
\(x=\frac{75}{137}\)
\(\text{Bài }2\text{ : Tính bằng cách thuận tiện nhất : }\)
\(\frac{4}{5}\text{ x }\frac{3}{7}+\frac{4}{5}\text{ x }\frac{6}{7}-\frac{4}{5}\text{ x }\frac{4}{10}\)
\(=\frac{4}{5}\text{ x }\left(\frac{3}{7}+\frac{6}{7}-\frac{4}{10}\right)\)
\(=\frac{4}{5}\text{ x }\left(\frac{9}{7}-\frac{4}{10}\right)\)
\(=\frac{4}{5}\text{ x }\frac{31}{35}\)
\(=\frac{124}{175}\)
9x3 + 5x6 + 27 + 30 = 56
9x9 + 81 = 81 + 81 = 162
tick nha
\(\dfrac{7}{6}\) + \(\dfrac{5}{12}\) - \(\dfrac{1}{18}\) - 1
= \(\dfrac{42}{36}\) + \(\dfrac{15}{36}\) - \(\dfrac{2}{36}\) - \(\dfrac{36}{36}\)
= \(\dfrac{19}{36}\)
\(\dfrac{13}{6}\) + \(\dfrac{5}{18}+3-\dfrac{7}{12}\)
= \(\dfrac{78}{36}+\dfrac{10}{36}+\dfrac{108}{36}-\dfrac{21}{36}\)
= \(\dfrac{175}{36}\)
3 + \(\dfrac{11}{4}-\dfrac{1}{12}-\dfrac{3}{16}\)
= \(\dfrac{144}{48}+\dfrac{132}{48}-\dfrac{4}{48}-\dfrac{9}{48}\)
= \(\dfrac{263}{48}\)
\(\dfrac{2}{5}\) x \(\dfrac{7}{4}\) - \(\dfrac{2}{5}\) x \(\dfrac{3}{4}\)
= \(\dfrac{2}{5}\) x ( \(\dfrac{7}{4}\) - \(\dfrac{3}{4}\))
= \(\dfrac{2}{5}\) x \(\dfrac{4}{4}\)
= \(\dfrac{2}{5}\)
5x1=5
5x2=10
5x3=15
5x4=20
5x5=25
5x6=30
5x7=35
5x8=40
5x9=45
5x10=50
mọi người nha ^_^
\(\frac{3}{5}.x-x=\frac{-4}{15}\)
<=>\(x.\left(\frac{3}{5}-1\right)=\frac{-4}{15}\)
<=>\(\frac{-2}{5}.x=\frac{-4}{15}\)
<=>\(x=\frac{-4}{15}:\frac{-2}{5}\)
<=>\(x=\frac{2}{3}\)
vậy \(x=\frac{2}{3}\)
Ta có:\(\frac{3}{5}.x-x=-\frac{4}{15}\)
\(\left(\frac{3}{5}-1\right).x=-\frac{4}{15}\)
\(\left(\frac{3}{5}-\frac{5}{5}\right).x=-\frac{4}{15}\)
\(\left(-\frac{2}{5}\right).x=-\frac{4}{15}\)
\(x=-\frac{4}{15}:\left(-\frac{2}{5}\right)\)
\(x=-\frac{4}{15}.\left(-\frac{5}{2}\right)\)
\(x=\frac{\left(-4\right).\left(-5\right)}{15.2}\)
\(x=\frac{20}{30}=\frac{2}{3}\)
B=\(1+3^2+3^4+...+3^{100}\)
9B=\(3^2+3^4+...+3^{100}\)
9B-B=\(\left(3^2+3^4+...+3^{102}\right)-\left(1+3^2+3^4+...+3^{100}\right)\)
8B=\(3^{102}-1\)
B=\(\left(3^{102}-1\right):8\)
C=\(1+5^3+5^6+...+5^{99}\)
125C=\(5^3+5^6+5^9+...+5^{102}\)
125C-C=\(\left(5^3+5^6+5^9+...+5^{102}\right)-\left(1+5^3+5^6+...+5^{99}\right)\)
124C=\(5^{102}-1\)
C=\(\left(5^{102}-1\right):124\)
45 : 3 = 15
21 x 9 = 189
5 x 6 + 5 x 3 + 5 = 30 + 15 + 5 = 45 + 5 = 50
9 x 9 : 3 = 27
k mình nhé mình trả lời nhanh nhất
45:3=15
21x9=189
5x6+5x3+5
=5x(6+3+1)
=5x10
=10
9x9:3
=81:3
=27