-37.(63 + 12) + 63.(37 - 12)

= -37.63 + (-37).12 + 63.37 - 63.12

= [-37.63 + 63.37] + [-37.12 - 63.12]

= 0 + [-37.12 - 63.12]

= -37.12 - 63.12

= (-37 - 63).12

= -100.12

= -1200

37 × 59 + 63 × 29 - 37 × 41 - 63 × 11

= 37 × (59 - 41) + 63 × (29 - 11)

= 37 × 18 + 63 × 18

= 18 × (37 + 63)

= 18 × 100

= 1800

=37*59-37*41+63*29-63*11

=37*(59-41)+63(29-11)

=37*18+63*18

=18(37+63)

=18*100

=1800

37 . 75 + 37 . 45 + 63 . 67 + 63 . 53 

= ( 75 + 45 ) . 37 + ( 67 + 53 ) . 63

=      120 . 37 +           120 . 63 

=       120 . ( 37 + 63 )

=       120 . 100

=        12000

37.75+37.45+63.67+63.53

=37(75+45)+63(67+53)

=37.120+63.120

=(37+63)120

=100.120

=12000

tk nha phamthiminhtrang

37 x 75 + 37 x 45 + 63 x 67 + 63 x 53

=  37 x ( 75 + 45 ) + 63 x ( 67 + 53 )

= 37 x 120 + 63 x 120 

= 120 x ( 37 + 63 )

= 120 x 100

= 12000

\(\frac{8}{35}+\frac{8}{63}+\frac{8}{99}+...+\frac{8}{575}\)

= \(4x\left(\frac{2}{3x5}+\frac{2}{5x7}+\frac{2}{7x9}+...+\frac{2}{23x25}\right)\)

= \(4x\left(\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+\frac{1}{7}-\frac{1}{9}+...+\frac{1}{23}-\frac{1}{25}\right)\)

=\(4x\left(\frac{1}{3}-\frac{1}{25}\right)\)

= \(4x\frac{22}{75}\)

=\(\frac{88}{75}\)

=\(4.\left(\frac{2}{5.7}+\frac{2}{7.9}+\frac{2}{9.11}+...+\frac{2}{23.25}\right)\)

=\(4.\left(\frac{1}{5}-\frac{1}{7}+\frac{1}{7}-\frac{1}{9}+...+\frac{1}{23}-\frac{1}{25}\right)\)

=\(4.\left(\frac{1}{5}-\frac{1}{25}\right)\)

=\(4.\frac{22}{75}\)

=\(\frac{88}{75}\)

\(\dfrac{63^3-37^3}{26}+\dfrac{63}{37}\)

\(=100+2\cdot63\cdot37+\dfrac{63}{37}\)

\(=\dfrac{176257}{37}\)

\(\dfrac{63^3-37^3}{26}+\dfrac{63}{37}\)

\(=100+2\cdot63\cdot37+\dfrac{63}{37}\)

\(=\dfrac{176257}{37}\)

37x38+63x37-37

=37x ( 38+63-37 )

=37 x 64

=2368

= 37.( 38+72) + 63. (59+51)

= 37.110 + 63. 110

= ( 37+63) . 110

= 100 . 110

= 1100

37.28 + 37.72 + 63.59 + 63.41

= 37( 28 + 72 ) + 63( 59 + 41 )

= 37.100 + 63.100

= 100. ( 37 + 63 )

= 100.100

= 10000

P/s: mk sửa lại đề roy nhé

37 . 38 + 37 . 72 + 63 . 59 + 63 . 51

= 37 . ( 38 + 72 ) + 63 . ( 59 + 51 )

= 37 . 110 + 63 . 110

= 110 . ( 37 + 63 )

= 110 . 100

= 11000

Ta có:

37.41+37.63-63.37+63.41

=41(37+63)

=41.100

=4100

Ta có:

20-5x=15+6x-6

<=>20-5x-15-6x+6=0

<=>11-11x=0

<=>11x=11

<=>x=1

Vậy x=1