( 8/14 + 6/14 ) + ( 5/12 - 1/12 + 8/12 )

= 1 + ( 4/12 + 8/12 )

= 1 + 1 = 2

=(8/14+6/14 )+(5/12+8/12-1/12)

=1+1

=2

\(\frac{8}{14}+\frac{5}{12}+\frac{6}{14}+\frac{8}{12}-\frac{1}{12}\)

\(=\left(\frac{8}{14}+\frac{6}{14}\right)+\left(\frac{5}{12}+\frac{8}{12}-\frac{1}{12}\right)\)

\(=1+1=2\)

\(\frac{8}{14}+\frac{5}{12}+\frac{6}{14}+\frac{8}{12}-\frac{1}{12}\)

\(=\left(\frac{8}{14}+\frac{6}{14}\right)+\left(\frac{5}{12}+\frac{8}{12}-\frac{1}{12}\right)\)

\(=1+1=2\)

~ Hok tốt ~

\(\frac{8}{14}+\frac{5}{12}+\frac{6}{14}+\frac{8}{12}-\frac{1}{12}\)

\(=\left(\frac{8}{14}+\frac{6}{14}\right)+\left(\frac{5}{12}+\frac{8}{12}-\frac{1}{12}\right)\)

\(=1+1\)

\(=2\)

1.a,=(54+45+1).113

=100.113

=11300

b,=(3/7+8/14)+(4/9+10/18)

=1+1

=2

2.a,=13/10+1/3

=49/30

b,=12/9.(1/12+1/6)

=12/9.1/4

=1/3

c,=3/4.3/2

=9/8

d,=3/2-1/3

=7/6

1:tính bằng cách thuận tiện nhất:

a)54 x 113 + 45 x 113 + 113

= 54 x 113 + 45 x 113 + 113x1

=113 x(54+45+1)

= 113x100

=1300

 b)3/7 + 4/9 + 8/14 + 10/18

=(3/7+8/14)+(4/9+10/18)

=    1           + 1

=2

a.      ( 6 x 8 – 48 ) : ( 10 + 11 + 12 + 13 + 14 + 15 )

= (48 – 48) : ( 10 + 11 + 12 + 13 + 14 + 15 )

= 0 : ( 10 + 11 + 12 + 13 + 14 + 15 )

= 0

mk tưởng bn học lớp 1

kg có cậu trả lời đi

not, mk lười lắm :)

( 6 x 8 – 48) : ( 10 + 11 + 12 + 13 + 14 + 15 )

= (48 – 48) : ( 10 + 11 + 12 + 13 + 14 + 15 )

= 0 : ( 10 + 11 + 12 + 13 + 14 + 15 )

= 0

câu trả lời là 0

Dh8s 8djr8xnikjtzndirnjxoxhtkfonycnfjdukdfmmg

Bdirnmfmfnhxhmffkxikdmfnfhxnzjdnyxjdm

Vsmdmdj

A = (1- 2) \(\times\) ( 4 - 3) \(\times\) (5 - 6) \(\times\) (8 - 7) \(\times\) (9 - 10) \(\times\) (12 - 11) \(\times\)(13 - 14)

A = (-1) \(\times\) 1 \(\times\) (-1)  \(\times\) 1 \(\times\) (-1) \(\times\) 1 \(\times\) (-1)

A = 1

A  =\(\frac{2}{5}\times\frac{4}{7}+\frac{3}{5}\times\frac{4}{7}\)  B = \(\frac{17}{13}\times\frac{12}{17}-\frac{4}{13}\times\frac{12}{17}\)   C = \(\frac{9}{14}:\frac{6}{7}+\frac{5}{14}:\frac{6}{7}\)  D =\(\frac{9}{12}:\frac{7}{9}\times\frac{12}{19}\)

=  \(\frac{4}{7}\times\left(\frac{2}{5}+\frac{3}{5}\right)\)              =\(\left(\frac{17}{13}-\frac{4}{13}\right)\times\frac{12}{17}\)                = \((\frac{9}{14}+\frac{5}{14}):\frac{6}{7}\)         = \(\frac{9}{12}\times\frac{9}{7}\times\frac{12}{19}\)

=\(\frac{4}{7}\times1\)                                     = \(1\times\frac{12}{17}\)                                       = \(1:\frac{6}{7}\)                               = \(\frac{9\times9\times12}{12\times7\times19}\)

=\(\frac{4}{7}\)                                              =  \(\frac{12}{17}\)                                                =\(\frac{7}{6}\)                                    = \(\frac{9\times9}{7\times19}=\frac{81}{133}\)

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