+) 187 x ( 38 + 62 ) - 87 x ( 62 + 38 )
= ( 62 + 38 ) x ( 187 - 87 )
= 100 x 100
= 10000
p/s : làm từng phần đợi mk chút ^^
25 x { 32 : [ 12 - 4 + 4 x ( 16 : 8 ) ] }
= 25 x { 32 : [ 8 + 4 x 2 ] }
= 25 x { 32 : 16 }
= 25 x 2
= 50
\(187\times\left(38+62\right)-87\times\left(62+28\right).\)
\(=187\times100+87\times100\)
\(=100\times\left(187-87\right)\)
\(=100\times100\)
\(=10000\)
\(25\times\left\{32:\left[12-4+4\times\left(16:8\right)\right]\right\}\)
\(=25\left\{32:\left[12-4+4\times2\right]\right\}\)
\(=25\times\left\{32:\left[12-4+8\right]\right\}\)
\(=25\times\left\{32:16\right\}\)
\(=25\times2=50\)
giúp mink tiêp nha tìm x :[ 231- ( x - 6 )x 13 = 1339
10 + 2 xX = 42
10 + 2x = 4^2
10 + 2x = 16
2x = 6
x = 3
