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=21 .[ 2232 : 8 - 180 ] + 21
=21.99 +21
=2100
\(21\cdot\left[\left(1245+987\right):2^3-15\cdot12\right]+21\)
\(=21\left(279-180+1\right)\)
\(=21\cdot100=2100\)
\(-\left(125+48+11\right)-\left(15-5-21\right)\)
\(=-125-48-11-15+5+21\)
\(=-140+5-48+10\)
\(=-130-43\)
=-173
\(B=\dfrac{3}{2}-\dfrac{2}{21}-\left\{\dfrac{7}{12}-\left[\dfrac{15}{21}-\left(\dfrac{1}{3}-\dfrac{5}{4}\right)-\left(\dfrac{2}{7}+\dfrac{1}{3}\right)\right]\right\}\)
\(B=\dfrac{3}{2}-\dfrac{2}{21}-\left\{\dfrac{7}{12}-\left[\dfrac{15}{21}-\left(-\dfrac{11}{12}\right)-\dfrac{13}{21}\right]\right\}\)
\(B=\dfrac{3}{2}-\dfrac{2}{21}-\left\{\dfrac{7}{12}-\dfrac{85}{84}\right\}\)
\(B=\dfrac{3}{2}-\dfrac{2}{21}-\left(-\dfrac{3}{7}\right)\)
\(B=\dfrac{11}{6}\)
\(=\dfrac{3}{2}-\dfrac{2}{21}-\dfrac{7}{12}+\left[\dfrac{15}{21}-\dfrac{1}{3}+\dfrac{5}{4}-\dfrac{2}{7}-\dfrac{1}{3}\right]\)
=11/12-2/21+5/7-2/3+5/4-2/7
=11/12-2/3+5/4-2/21+3/7
=11/12-8/12+15/12-2/21+9/21
=18/12+7/21
=3/2+1/3
=9/6+2/6=11/6
\(\frac{7}{3}\div\frac{5}{7}\div\frac{21}{5}=\frac{7}{3}\times\frac{7}{5}\times\frac{5}{21}=\frac{7}{9}\)
a) \(\frac{-1}{3}+\left|\frac{-5}{3}\right|=\frac{-1}{3}+\frac{5}{3}=\frac{4}{3}\)
b) \(\left|\frac{-25}{21}\right|-\left|\frac{-17}{21}\right|=\frac{25}{21}-\frac{17}{21}=\frac{8}{21}\)
(21-43)-(57-36)-(64+21)
=21-43-57+36-64-21
=21+(-43)+(-57)+36+(-64)+(-21)
=[21+(-21)]+[(-43)+(-57)]+[36+(-21)]+(-64)
=0+(-100)+15+(-64)
=-149
*** nhe