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=145x(99+1)-143x(101-1)
=145x100 - 143x100
=100x(145-143)
=100x2
=200
(145x99+145)-(143x101-143)
=145x(99+1)-143x(101-1)
=145x100-143x100
=14500-14300
=200
vì mọi số nhân vs 1 bằng chính nó mà
( 145 x 99 + 145 ) - ( 143 x 101 - 143 )
= ( 145 x ( 99 + 1 ) - ( 143 x ( 101 - 1 )
= 145 x 100 - 143 x 100
= 14500 - 14300
= 200
( 145 x 99 + 145 ) - ( 143 x 101 - 143 )
= ( 145 x ( 99 + 1 ) - ( 143 x ( 101 - 1 )
= 145 x 100 - 143 x 100
= 14500 - 14300
= 200
\(\left(145.99+145\right)-\left(143-101.143\right)\)
\(=\left[145.\left(99+1\right)\right]-\left[143.\left(1-101\right)\right]\)
\(=\left[145.100\right]-\left[143.\left(-100\right)\right]\)
\(=14500-\left(-14300\right)\)
\(=14500+14300\)
\(=28800\)
\(\left(145\times99+145\right)-\left(143-101\times143\right)\)
\(=\left(145\times100\right)-\left(143\times\left(-100\right)\right)\)
\(=14500-\left(-14300\right)\)
\(=28800\)
c) \(\left(11+12+13+...+19\right).\left(6.8-48\right)=\left(11+12+13+...+19\right).\left(48-48\right)\)
\(=\left(11+12+13+...+19\right).0\)
\(=0\)
Hok "tuốt" nha^^
b) \(\left(500.9-250.18\right).\left(1+2+3+...+9\right)=\left(250.2.9-250.18\right).\left(1+2+...+9\right)\)
\(=\left(250.18-250.18\right).\left(1+2+3+...+9\right)\)
\(=0.\left(1+2+3+...+9\right)\)
\(=0\)
Hok tốt nha^^ (lần 2)
Ta có: ( 145 x 99 + 145 ) - ( 143 x 102 - 143 )
= [145.(99 + 1)] - [143.(102 - 1)]
= (145.100) - (143.101)
= .........................
( 145 x 99 + 145 ) - ( 143 x 101 - 143 )
= ( 145 x 99 + 145 x 1 ) - ( 143 x 101 - 143 x 1 )
= { 145 x ( 99 + 1 ) } - { 143 x ( 101 - 1 ) }
= 145 x 100 - 143 x 100
= 100 x ( 145 - 143 )
= 100 x 2
= 200
TK mk nha bn !!
( 145 x 99 + 145 ) - ( 143 x 101 - 143 )
= 145 x ( 99+ 1) - 143 x ( 101 - 1 )
= 145 x 100 - 143 x 100
= 14500 -14300
= 200