a.35 x 34 + 35 x 38 + 65 x 75 + 45 x 65

= 35 x (34 + 38) + 65 x 75 + 65 x 45

= 35 x     72      + 65 x (75+45)

= 35 x 72 + 65 x 120

= 35 x 72 + 65 x (72 + 48)

= 35 x 72 + 65 x 72 + 65 x 48

= (35+65) x 72 + 65  x 48

=   100 x 72 + 65 x 48

=      7200   +    3120

=           10320

b.39 x 8 + 60 x 2 + 21 x 8

=39 x 8 + 15 x 4 x 2 +21 x 8

= 39 x 8 + 15 x 8 + 21 x 8

=(39 + 15 + 21) x 8

=      75            x 8

=             600

c.58 x 75 + 58 x 50 - 58 + 25

= 58 x 75 + 58 x 50 - 58 x 1 + 25

= 58 x(75+50-1)+25

= 58 x   124     + 25

=    7192          + 25

=              7217

d.125 x 98 - 125 x 46 - 52 x 25

= 25 x 5 x 98 - 25 x 5 x 46 - 25 x 52

= 25 x 490 - 25 x 230 - 25 x 52

= 25 x (490 - 230 - 52)

= 25 x      208

=       5200

ham mo chi qua

\(25+20+60+21-30+58-60\)

\(=\left(25+21\right)+\left(20+60\right)-30+58-60\)

\(=46+80-30+58-60\)

\(=126-30+58-60\)

\(=96+58-60\)

\(=154-60=94\)

bằng94

25+20+60+21-30+58-60=94

nha bn!😀

câu hỏi tương tự!!!

`3 . 10^2 - [ 2 . 3^2 - (60 - 58)^2 + 25^0]`

`=3.100 - ( 2 .9 - 4 +1)`

`= 3.100 -(18- 4 +1)`

`= 3.100 -(14+1)`

`= 3.100 -15`

`=300-15`

`=285`

\(58\times57+58\times50-58\times25=58\times\left(57+50-25\right)=4756\)

58 × 57 + 58 × 50 - 58 × 25

= 58 × (57 + 50 - 25)

= 58 × 82

= 4756

58 x 57 + 58 x 50-58 x 25

= 3306 + 2900 - 1450

= 4756

58 x 75 + 25 x 58 - 58 x 28

= 58 x ( 75 + 25 + 28 )

= 58 x 128

= 7424

58 x 75 + 25 x 58 - 58 x 28

= 58 x (75 + 25 - 28)

= 58 x 72

= 4176

= 4176  nha bn

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