x + 3/4 =3/5 x2
5+x/12= 2/3
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a)\(=\dfrac{16}{13}-\dfrac{3}{15}+\dfrac{6}{13}=\dfrac{22}{13}-\dfrac{3}{15}=\dfrac{96}{65}\)
b)\(=\dfrac{21}{8}-\left(\dfrac{5}{10}+\dfrac{6}{10}\right)=\dfrac{21}{8}-\dfrac{11}{10}=\dfrac{61}{40}\)
c)\(=\dfrac{27}{10}-3-\dfrac{4}{7}--\dfrac{61}{70}\)
a) \(A=\left\{22;23;24;25\right\}\)
b) \(B=\left\{0;1;2;3\right\}\)
c) \(C=\left\{14;16;18;20;22;24\right\}\)
d) \(D=\left\{1;3\right\}\)
4 × 125 × 25 × 8
= (4 × 25) × (125 × 8)
= 100 × 1000
= 100 000
2 × 8 × 50 × 25 × 125
= (2 × 50) × (8 × 125) × 25
= 100 × 1000 × 125
= 12 500 000
2 × 3 × 4 × 5 × 50 × 25
= (2 × 50) × (4 × 25) × (3 × 5)
= 100 × 100 × 15
= 150 000
25 × 20 × 125 × 8 - 8 × 20 × 5 × 125
= 8 × 125 × 20 × (25 - 5)
= 1000 × 20 × 20
= 400 000
- (25 x 4) x (125 x8)=100 x 1000 =100000
- (50 x 2) x (8 x 125) x 25=100 x 1000 x 25 =2500000
- (2 x 50 ) x (4 x 25) x (3 x5)=100 x 100 x 15=150000
- 25 x 20 x125 x 8 - 5
= (20 x 5) x (125 x 8) -25=100 x 1000 -5 =100000 - 5 =99995
a) \(\frac{15}{9}:\frac{3}{4}:\frac{7}{5}=\frac{15}{9}.\frac{4}{3}.\frac{5}{7}=\frac{300}{189}=\frac{100}{63}\)
b ) \(\frac{23}{7}.\frac{25}{2}-\frac{23}{7}.\left(5+\frac{1}{2}\right)=\frac{23}{7}.\left(\frac{25}{2}-\frac{11}{2}\right)=\frac{23}{7}.7=23\)
\(4^2-2^2.3+8.5^0\)
\(=16-4.3+8.1\)
\(=12\)
\(5^4.\left[8^2:4^2.\left(2^3+10^0\right)\right]\)
\(=625.\left[64:16.\left(8+1\right)\right]\)
\(=625.\left(64:16.9\right)\)
\(=22500\)
\(11^2.5^3-11^2.25\)
\(=11^2.\left(5^3-25\right)\)
\(=121.\left(125-25\right)\)
\(=12100\)
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bn gg ko đồng hành cùng bn à
ừ đ r