91 x 51 + 49 x 163 - 49 x 72
= 91 x 51 + 49 x ( 163 - 72 )
= 91 x 51 + 49 x 91
= 91 x ( 51 + 49 )
= 91 x 100
= 9100
91x51 + 49x163-49x72
=91x51+49x( 163-72)
=91x51+49x91
=91x(51+49)
=91x100
=9100
91 x 51 + 49 x 163 - 49 x 72
= 91 x 51 + 49 x ( 163 - 72 )
= 91 x 51 + 49 x 91
= 91 x ( 51 + 49 )
= 91 x 100
= 9100
91 x 51 + 49 x 163 - 49 x 72
= ( 91 x 51 ) + ( 49 x 163 ) - ( 49x72 )
= 4641 + 7987 - 3528
= 12628 - 3528
= 91000
91 x 51 + 49 x 163 - 49 x 72
= 91 x 51 + 49 x (163 - 72)
= 91 x 51 + 49 x 91
= 91 x (51 + 49)
= 91 x 100
= 9100
91 x 51 + 49 x 163 - 49 x 72
= 91 x 51 + 49 x ( 163 - 72 )
= 91 x 51 + 49 x 91
= 91 x ( 51 + 49 )
= 91 x 100
= 9100
TK mk nha = )))))
Tính nhanh :
91 × 51 + 49 × 163 - 49 × 72
= 91 × 51 + 49 × ( 163 - 72 )
= 91 × 51 + 49 × 91
= 91 × ( 51 + 49 )
= 91 × 100
= 9 100
91 x 51 + 49 x 163 - 49 x 72
= 91 x 51 + 49 x (163 - 72)
= 91 x 51 + 49 x 91
= 91 x 51 + 91 x 49
= 91 x (51 + 91)
= 91 x 100
= 9100
91 x 51 + 49 x 163 - 49 x 72
= 91 x 51 + 49 x ( 163 - 72 )
= 91 x 51 + 49 x 91
= 91 x ( 51 + 49)
= 91 x 100
= 9100
\(\text{ Tính nhanh}\)
\(91\text{ x }51+49\text{ x }163-49\text{ x }72\)
\(=91\text{ x }51+49\text{ x }\left(163-72\right)\)
\(=91\text{ x }51+49\text{ x }91\)
\(=91\text{ x }\left(51+49\right)\)
\(=91\text{ x }100\)
\(=9100\)
91 x 51 + 49 x 163 - 49 x 72
= 91 x 51 + 49 x ( 163 - 72 )
= 91 x 51 + 49 x 91
= 91 x ( 51 + 49 )
= 91 x 100
= 9100
hok tốt