13 x 8 + 250
= 13 x 8 + 13 x 2 + 224
= 13 x ( 8+2) + 224
= 13 x ( 8+2) + 224
= 354
c1: 13 x 8 + 250
= ( 13 x 8 ) + 250
= 104 + 250
= 354
c2: 13 x 8 + 250
= 104 + 250
= 354
Cách tính nhanh là:
13 x 8 + 250
= ( 13 x 8 ) + 250 = 354
13 x 8 + 250
= 13 x 8 + 26 + 224
= 13 x 8 + 13 x 2 + 224
= 13( 8 + 2 ) + 224
= 13 x 10 + 224
= 130 + 224
= 354
\(13.8+250\)
\(=\left(13.4\right).\left(8:4\right)+250\)
\(=52.2+125.2\)
\(=2.\left(52+125\right)\)
\(=2.177=354\)
13 x 8 + 250
= 13 x 8 + 26 + 224
= 13 x 8 + 13 x 2 + 224
= 13( 8 + 2 ) + 224
= 13 x 10 + 224
= 130 + 224
= 354
13*8+250= 354
mong bn giúp, cảm ơn nhìu lắm
13 x 8 + 250
= 13 x 8 + 13 x 2 + 224
= 13 x ( 8+2) + 224
=13 x 10 +224
= 130 + 224
= 354