tính nhanh
(37-575)-(475-63)
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-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
\(\frac{8}{35}+\frac{8}{63}+\frac{8}{99}+...+\frac{8}{575}\)
= \(4x\left(\frac{2}{3x5}+\frac{2}{5x7}+\frac{2}{7x9}+...+\frac{2}{23x25}\right)\)
= \(4x\left(\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+\frac{1}{7}-\frac{1}{9}+...+\frac{1}{23}-\frac{1}{25}\right)\)
=\(4x\left(\frac{1}{3}-\frac{1}{25}\right)\)
= \(4x\frac{22}{75}\)
=\(\frac{88}{75}\)
=\(4.\left(\frac{2}{5.7}+\frac{2}{7.9}+\frac{2}{9.11}+...+\frac{2}{23.25}\right)\)
=\(4.\left(\frac{1}{5}-\frac{1}{7}+\frac{1}{7}-\frac{1}{9}+...+\frac{1}{23}-\frac{1}{25}\right)\)
=\(4.\left(\frac{1}{5}-\frac{1}{25}\right)\)
=\(4.\frac{22}{75}\)
=\(\frac{88}{75}\)
\(\dfrac{63^3-37^3}{26}+\dfrac{63}{37}\)
\(=100+2\cdot63\cdot37+\dfrac{63}{37}\)
\(=\dfrac{176257}{37}\)
\(\dfrac{63^3-37^3}{26}+\dfrac{63}{37}\)
\(=100+2\cdot63\cdot37+\dfrac{63}{37}\)
\(=\dfrac{176257}{37}\)
= 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
(37-575)-(475-63)=37-575-475+63=(37+63)+(575-475)=100+100=200
37+575+(-475)+(-63)=575+475