a)
13 x 81 + 13 x 19
= 13 x ( 81 + 19 )
= 13 x 100 = 1300
b)
246 x 83 + 246 x 17
= 246 x ( 83 + 17 )
= 246 x 100
= 24600
c)
246 x 83 + 247 x 17
= 246 x 83 + 246 x 17 + 17
= 246 x ( 83 + 17 ) + 17
= 246 x 100 + 17
= 24600 + 17
= 24617
Ủng hộ mik nhak !!!
13x81+13x19
=13x(19+81)
=13x100
=1300
246x83+246x17
=246x(83+17)
=246x100
=24600
(81+19) x13=
100x13
=1300
cac cau con lai cung vay do
= ( 81 + 19 ) x 13
= 100 x 13
= 1300
= ( 83 + 17 ) x 246
= 100 x 246
= 24600
= 246 x 83 + 246 x 17 + 17
= ( 83 + 17 ) x 246 + 17
= 100 x 246 + 17
= 24600 + 17
= 24617
13x81+13x19 246x63+246x17 246x83+247x17
=13x(81+19) =246x(63+17) =246x247x(83+17)
=13x100 =246x100 =60762x100
=1300 =24600 =6076200
