Question

xin đấy giúp tôi 3 bài này ik làm ơn 

Answer 1

tách câu re đi

Answer 2

1.

a.(5/12+7/12)*3/10

=1*3/10=3/10

b.(15/8-7/8)*6/9

=1*6/9=6/9

c.\(\dfrac{15\cdot4\cdot13\cdot4}{8\cdot13\cdot5\cdot12}\)=\(\dfrac{5\cdot3\cdot4\cdot4}{2\cdot4\cdot5\cdot3\cdot4}\)=\(\dfrac{1}{2}\)

 

Answer 3

d.\(\dfrac{6\cdot7\cdot8\cdot9}{2\cdot9\cdot2\cdot8\cdot2\cdot7\cdot2\cdot6}\)=\(\dfrac{1}{2\cdot2\cdot2\cdot2}\)=\(\dfrac{1}{16}\)

e.\(\dfrac{4\cdot5\cdot3\cdot9\cdot12\cdot2}{3\cdot12\cdot4\cdot2\cdot5}\)=9

Answer 4

1.

a.(5/12+7/12)*3/10

=1*3/10=3/10

b.(15/8-7/8)*6/9

=1*6/9=6/9

c.5⋅3⋅4⋅42⋅4⋅5⋅3⋅45⋅3⋅4⋅42⋅4⋅5⋅3⋅4=6⋅7⋅8⋅92⋅9⋅2⋅8⋅2⋅7⋅2⋅66⋅7⋅8⋅92⋅9⋅2⋅8⋅2⋅7⋅2⋅6=116116

e.