G=1/4*7+1/4*9+1/5*11+1/6*11+1/6*13+1/7*13
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G=14⋅7+14⋅9+15⋅11+16⋅11+16⋅13+17⋅13cap G equals one-fourth center dot 7 plus one-fourth center dot 9 plus one-fifth center dot 11 plus one-sixth center dot 11 plus one-sixth center dot 13 plus one-seventh center dot 13 Giải 1 Thực hiện phép nhân G=14⋅7+14⋅9+15⋅11+16⋅11+16⋅13+17⋅13cap G equals one-fourth center dot 7 plus one-fourth center dot 9 plus one-fifth center dot 11 plus one-sixth center dot 11 plus one-sixth center dot 13 plus one-seventh center dot 13 G=74+14⋅9+15⋅11+16⋅11+16⋅13+17⋅13cap G equals seven-fourths plus one-fourth center dot 9 plus one-fifth center dot 11 plus one-sixth center dot 11 plus one-sixth center dot 13 plus one-seventh center dot 13 2 Thực hiện phép nhân G=74+14⋅9+15⋅11+16⋅11+16⋅13+17⋅13cap G equals seven-fourths plus one-fourth center dot 9 plus one-fifth center dot 11 plus one-sixth center dot 11 plus one-sixth center dot 13 plus one-seventh center dot 13 G=74+94+15⋅11+16⋅11+16⋅13+17⋅13cap G equals seven-fourths plus nine-fourths plus one-fifth center dot 11 plus one-sixth center dot 11 plus one-sixth center dot 13 plus one-seventh center dot 13 3 Thực hiện phép nhân G=74+94+15⋅11+16⋅11+16⋅13+17⋅13cap G equals seven-fourths plus nine-fourths plus one-fifth center dot 11 plus one-sixth center dot 11 plus one-sixth center dot 13 plus one-seventh center dot 13 G=74+94+115+16⋅11+16⋅13+17⋅13cap G equals seven-fourths plus nine-fourths plus eleven-fifths plus one-sixth center dot 11 plus one-sixth center dot 13 plus one-seventh center dot 13 4 Thực hiện phép nhân G=74+94+115+16⋅11+16⋅13+17⋅13cap G equals seven-fourths plus nine-fourths plus eleven-fifths plus one-sixth center dot 11 plus one-sixth center dot 13 plus one-seventh center dot 13 G=74+94+115+116+16⋅13+17⋅13cap G equals seven-fourths plus nine-fourths plus eleven-fifths plus eleven-sixths plus one-sixth center dot 13 plus one-seventh center dot 13 5 Thực hiện phép nhân G=74+94+115+116+16⋅13+17⋅13cap G equals seven-fourths plus nine-fourths plus eleven-fifths plus eleven-sixths plus one-sixth center dot 13 plus one-seventh center dot 13 G=74+94+115+116+136+17⋅13cap G equals seven-fourths plus nine-fourths plus eleven-fifths plus eleven-sixths plus thirteen-sixths plus one-seventh center dot 13 6 Thực hiện phép nhân G=74+94+115+116+136+17⋅13cap G equals seven-fourths plus nine-fourths plus eleven-fifths plus eleven-sixths plus thirteen-sixths plus one-seventh center dot 13 G=74+94+115+116+136+137cap G equals seven-fourths plus nine-fourths plus eleven-fifths plus eleven-sixths plus thirteen-sixths plus thirteen-sevenths 7 Thực hiện phép cộng G=74+94+115+116+136+137cap G equals seven-fourths plus nine-fourths plus eleven-fifths plus eleven-sixths plus thirteen-sixths plus thirteen-sevenths G=42235cap G equals 422 over 35 end fraction Ẩn bớt Đáp án G=42235cap G equals 422 over 35 end fraction Dạng thức khác
1+2-3-4+5+6-7-8+9+................+33
=1+(2-3-4+5)+(6-7-8+9)+............+(30-31-32+33)
=1+0+0+..............+0
=1
B=1/4x (7+9) + 1/5x(9+11) + 1/6x(11+13) + 1/7x13
=4+2+4+\(\frac{13}{7}\)=10+\(\frac{13}{7}\)=\(\frac{83}{7}\)
\(A,\dfrac{7}{11}+\dfrac{5}{6}-\dfrac{-4}{11}-\dfrac{1}{6}\)
\(= (\dfrac{7}{11}+\dfrac{-4}{11})-(\dfrac{5}{6}-\dfrac{1}{6})\)
\(=\dfrac{3}{11}-\dfrac{2}{3}\)
\(= \dfrac{9}{33}-\dfrac{22}{33}\)
\(= \dfrac{-13}{33}\)
\(B,\dfrac{5}{9}.\dfrac{7}{3}+\dfrac{5}{9}.\dfrac{9}{13}-\dfrac{5}{9}:\dfrac{13}{5}\)
\(=(\dfrac{5}{9}.\dfrac{5}{9}:\dfrac{5}{9}).\dfrac{7}{3}+\dfrac{9}{13}-\dfrac{13}{5}\)
\(=(\dfrac{5}{9}.\dfrac{7}{3})+(\dfrac{9}{13}-\dfrac{13}{5})\)
\(=(\dfrac{5}{9}.\dfrac{21}{9})+(\dfrac{45}{65}-\dfrac{169}{65})\)
\(=\dfrac{35}{27}+\dfrac{-124}{65}\)
\(=\dfrac{2275}{1755}+\dfrac{-3348}{1755}\)
\(=\dfrac{-1073}{1755}\)