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43.61 + 86.45 - 129.17
= 43.61 + 43.2.45 - 43.3.17
= 43.(61 + 2.45 - 3.17)
= 43. 100
= 4300
\(43\cdot61+86\cdot45-129\cdot17\)
\(=43\cdot61+43\cdot2\cdot45-43\cdot3\cdot17\)
\(=43\cdot\left(61+90-51\right)\)
\(=43\cdot100\)
\(=4300\)
=(-259+259)+[(-74)+(-26)]+(-81+581)
=0+(-100)+500
=400
= -259 + 259 - 74 - 26 + 581 + 259 - 81
= 0 - 100 + 840 - 81
= 659
\(1\frac{13}{15}.0,75-\left(\frac{104}{195}+25\%\right).\frac{24}{47}-3\frac{12}{13}:3\)
\(=\frac{28}{15}.\frac{3}{4}-\left(\frac{8}{15}+\frac{1}{4}\right).\frac{8}{9}-\frac{51}{13}.\frac{1}{3}\)
\(=\frac{7}{5}-\left(\frac{32}{60}+\frac{15}{60}\right).\frac{8}{9}-\frac{17}{13}\)
\(=\frac{7}{5}-\frac{47}{60}.\frac{8}{9}-\frac{17}{13}\)
\(=\frac{7}{5}-\frac{94}{135}-\frac{17}{13}\)
\(=\frac{-212}{351}\)
Tự quy đồng
\(2\frac{3}{4}.\left(-0,4\right)-1\frac{3}{5}.2,75+\left(-1,2\right):\frac{4}{11}\)
\(=\frac{11}{4}.\frac{-2}{5}-\frac{8}{5}.\frac{11}{4}-\frac{6}{5}.\frac{11}{4}\)
\(=\frac{11}{4}.\left(\frac{-2}{5}-\frac{8}{5}-\frac{6}{5}\right)\)
\(=\frac{11}{4}.\frac{-16}{5}\)
\(=\frac{-44}{5}=-8\frac{4}{5}\)
\(=2.6\cdot\left(-2\right):2=2.6\cdot\left(-1\right)=-2.6\)
a) (-124) + 24 = -100
b) 37. 78 + 37. 22
= 37 . ( 78 + 22 )
= 37 . 100
= 3700
43.61 + 86.45 - 129.17
= 43.61 + 43.2.45 - 43.3.17
= 43.(61 + 2.45 - 3.17)
= 43.(61 + 90 - 51)
= 43.100
= 4300
43 . 61 + 86 . 45 - 129 . 17
= 43. 61 + 43 .2 . 45 - 43 . 3 .17
= 43 . 61 + 43 . 90 - 43 . 51
= 43 . (61 + 90 - 51)
= 43 . 100
= 4300