Question

tinh bang cach thuan tien

7,89 x 54 - 7,89 x 52 -7,89

Answer 1

7,89 x 54 - 7,89 x 52 -7,89

7,89x{54-52-1}

7,89x1=7,89

k nha!

Answer 2

=7,89x(54-52-1)=7,89x1=7,89

Answer 3

7,89 x 54 - 7,89 x 52 - 7,89

<=> 7,89 x 54 - 7,89 x 52 - 7,89 x 1

= 7,89 x ( 54 - 52 - 1)

= 7,89 x ( 2 - 1 )

= 7,89 x 1

= 7,89

nha bn

Answer 4

7,89 x 54 - 7,89 x 52 - 7,89=7,89 x (54-52-1)=7,89

Answer 5

\(7,89.54-7,89.52-7,89\)

\(=7,89.54-7,89.52-7,89.1\)

\(=7,89.\left(54+52+1\right)\)

\(=7,89.107\)

\(=7,89.\left(100+7\right)\)

\(=7,89.100+7,89.7\)

\(=789+55,23\)

\(=844,23\)

Answer 6

\(7,89\times54-7,89\times52-7,89.\)

\(=7,89\times54-7,89\times52-7,89\times1\)

\(=7,89\times\left(54-52-1\right)\)

\(=7,89\times1\)

\(=7,89\)

Answer 7

7,89 x 54 - 7,89 x 52 - 7,89

= 7,89 x ( 54 - 52 - 1 )

= 7,89 x ( 2 - 1 )

= 7,89 x 1

= 7,89

k nha hoahauhanvu

Answer 8

7,89.54-7,89.52-7,89

=7,89.54-7,89.52-7,89.1

=7,89.(54-52-1)

=7,89.1

=7,89

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