236+14
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11: \(=215\cdot\left(-14+1236\right)+215\cdot\left(14-236\right)\)
\(=215\left(-14+1236+14-236\right)=215\cdot1000=215000\)
12: \(=125\cdot25-125\cdot89+128\cdot89-128\cdot125\)
\(=125\cdot\left(-103\right)+89\cdot3\)
=-12608
107616 : 236 x 203=456 x 203 =92568
( 11/14 - 7/9 ) + 4/5 = 1/126 + 4/5 =509/630
sai thì thôi nha bạn
a) -65 .( 87 - 17 ) -87 .( 17 - 65 )
= ( - 65 ) . 87 + 17 - 87 . 17 + 65
= { ( - 65 ) + 65 } . 87 + 17
= 0 . 87 + 17
= 17
b) -215 . [ 14 + ( -236 ) ] + 215 . ( 14 - 236 )
= -215 . 14 + ( - 236 ) + 215 . 14 - 236
= [ ( - 215 ) + 215 ] . 14 + { ( - 236 - 236 }
= 0 . 14 + 0
= 0
a) 3.x + 30 = (-3)2
3.x + 30 = 9
3.x = 9 - 30
3.x = -21
x = -21 : 3
x = -7
b) 171 - 5(x + 7) = 236
5(x + 7) = 171 - 236
5(x + 7) = -65
x + 7 = -65 : 5
x + 7 = -13
x = -13 - 7
x = -20
c) -14 - (1 - 4x) = -7
1 - 4x = -14 - (-7)
1 - 4x = -7
4x = 1 + 7
4x = 8
x = 2
mik nhah nhất đó
k mik nha
a: \(=\left(5^2+3\right):7=28:7=4\)
b: \(=7^2-3^2+8\cdot25\)
=49-9+200
=240
98775 - 32 x 85
=98775 -2720
=96055
67500 - 24 x 236
= 67500 -5664
=61836
568 + 101598 : 287
= 568 +354
=922
6875 + 980 -180
=7855 -180
=7675
\(\dfrac{2}{5}+\dfrac{3}{10}-\dfrac{1}{2}\)
\(=\dfrac{7}{10}-\dfrac{1}{2}\)
= \(\dfrac{1}{5}\)
\(\dfrac{8}{11}+\dfrac{8}{33}x\dfrac{3}{4}\)
\(=\dfrac{8}{11}+\dfrac{2}{11}\)
\(=\dfrac{10}{11}\)
\(\dfrac{7}{9}x\dfrac{3}{14}:\dfrac{5}{8}\)
\(=\dfrac{1}{6}:\dfrac{5}{8}\)
\(=\dfrac{1}{6}x\dfrac{8}{5}\)
\(=\dfrac{8}{30}\)
\(=\dfrac{4}{15}\)
\(\dfrac{5}{12}-\dfrac{7}{32}:\dfrac{21}{16}\)
\(=\dfrac{5}{12}-\dfrac{7}{32}x\dfrac{16}{21}\)
\(=\dfrac{5}{12}-\dfrac{1}{6}\)
\(=\dfrac{5}{12}-\dfrac{2}{12}\)
\(=\dfrac{3}{12}=\dfrac{1}{4}\)

236 + 14 = 250
236 + 14 = 250 nha