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(22+21+22+23).20.21.22.23
=(4+2+4+8).1.2.4.8
=18.1.2.4.8
=1152
1 3/8+1/8:(0,75-1/2)-25%.1/2
=11/8+1/8:(3/4-1/2)-1/4.1/2
=12/8:1/4-1/8
=6/1-1/8
=47/8
12 1/3-5/6:(24-23 5/7)
=37/3-5/6:(24-166/7)
=37/3-5/6:2/7
=37/3-35/2
=31/6
(-1/2)2-(-2)2-50
=1/4-4-1
=-19/4
\(\left(2^2+2^1+2^2+2^3\right)×2^0×2^1×2^2×2^3\)
\(=\left(4+2+4+8\right)×1×2×4×8\)
\(=18×1×2×4×8\)
\(=1152\)
\(1\frac{3}{8}+\frac{1}{8}:\left(0,75-\frac{1}{2}\right)-25\%×\frac{1}{2}\)
\(=\frac{11}{8}+\frac{1}{8}:\left(\frac{3}{4}-\frac{1}{2}\right)-\frac{1}{4}×\frac{1}{2}\)
\(=\frac{11}{8}+\frac{1}{8}:\frac{1}{4}-\frac{1}{8}\)
\(=\frac{11}{8}+\frac{1}{2}-\frac{1}{8}\)
\(=\frac{7}{4}\)
\(12\frac{1}{3}-\frac{5}{6}:\left(24-23\frac{5}{7}\right)\)
\(=\frac{37}{3}-\frac{5}{6}:\left(24-\frac{166}{7}\right)\)
\(=\frac{37}{3}-\frac{5}{6}:\frac{2}{7}\)
\(=\frac{37}{3}-\frac{35}{12}\)
\(=\frac{113}{12}\)
\(\left(\frac{-1}{2}\right)^2-\left(-2\right)^2-5^0\)
\(=\frac{1}{4}-4-1\)
\(=\frac{-19}{4}\)
\(C=2^0+2^1+2^2+2^3+2^0+2^1+2^2+2^3\)
\(=\left(2^0.2\right)+\left(2^1.2\right)+\left(2^2.2\right)+\left(2^3.2\right)\)
\(=2+4+8+16\)
\(=\left(2+8\right)+\left(4+16\right)\)
\(=10+20\)
\(=30\)
\(D=\left(2^0+2^1+2^2+2^3\right).2^0.2^1.2^2.2^3\)
\(=\left(1+2+4+8\right).1.2.4.8\)
\(=\left(8+2+4+1\right).1.2.4.8\)
\(=\left(10+4+1\right).1.2.4.8\)
\(=15.1.2.4.8\)
\(=\left(15.2\right).1.4.8\)
\(=30.1.4.8\)
\(=120.8\)
\(=960\)
\(\left(1+2^2+2^3+....+2^{10}\right)\cdot\left(3^2\cdot2^4-12^2\right)\)
\(=\left(1+2^2+2^3+....+2^{10}\right)\cdot\left(3^2\cdot2^{2\cdot2}-12^2\right)\)
\(=\left(1+2^2+2^3+....+2^{10}\right)\cdot\left(3^2\cdot2^2\cdot2^2-12^2\right)\)
\(=\left(1+2^2+2^3+...2^{10}\right)\cdot\left[\left(3\cdot2\cdot2\right)^2-12^2\right]\)
\(=\left(1+2^2+2^3+....+2^{10}\right)\cdot\left[12^2-12^2\right]\)
\(=\left(1+2^2+2^3+...+2^{10}\cdot0\right)\)
\(=0\)
Tính hop ly
21.49-11.49+90.49+49.125.16
= 49.( 21 - 11 + 90 + 125 . 16 )
= 49 . ( 10 + 90 + 2000 )
= 49 . 2100
= 102900
(22+21+22+23).20.21.22.23
= ( 4 + 2 + 4 + 8 ) . 1 . 2 . 4 . 8
= 18 . 64
= 1152
Study well
\(21.49-11.49+90.49+49.125.16\)
\(=49.\left(21-11+90+125.16\right)\)
\(=49.\left(10+90+2000\right)=49.2100\)
\(=102900\)