-39 . ( 5 - 99 ) + 99 . ( 10 - 99 )
= ( -39 ) . ( -94 ) + 99 . ( -89 )
= 3666 + ( -8811 )
= -5145
\(-39\cdot\left(5-99\right)+99\cdot\left(10-99\right)\)
\(=-39\cdot5-\left(-39\right)\cdot99+99\cdot10-99\cdot99\)
\(=-39\cdot5+39\cdot99+99\cdot10-99\cdot99\)
\(=-39\cdot5+99\cdot\left(39+10-99\right)\)
\(=-39\cdot5+99\cdot50\)
\(=-195+4950\)
\(=4755\)
-39 x ( 5 - 99 ) + 99 x ( 10 - 99 )
= -39 x 5 + 39 x 99 + 99 x 10 - 99 x 99
= -39 x 5 + 99 ( 39 + 10 - 99 )
= -39 x 5 + 99 x ( -50 )
= - 39 x 5 - 990 x 5
= ( - 39 - 990 ) x 5
= -1029 x 5
= -5145
a mk sửa lại chỗ
\(-39\cdot5+99\cdot\left(39+10-99\right)\)
\(=-39\cdot5+99\cdot\left(-50\right)\)
\(=-195+-4950\)
\(=-5145\)
Mình tả lời luôn nhá
= -39.5-99+99.10-99
= [ (-99)+99].10+(-39-99).5
= 0.10 + 350
= 350
vậy đáp án là 350
