1) 32 ( 8/15 ) - ( - 4 ( 2/3 )) = 32 ( 8/15 ) + 4 ( 2/3 ) = 32 ( 8/15 ) + 4 ( 10/15 ) =
= 36 ( 18/15 ) = 37 ( 3/15 ) = 37 ( 1/5 ) = 37,2
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2) 12 ( 3/7 ) * ( - 14/29 ) = 87/7 * ( - 14/29 ) = ( - 6 )
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3) - 1 ( 1/3 ) : ( - 2/3 ) = ( - 4/3 ) * ( - 3/2 ) = 2
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4) - 28 ( 5/9 ) - 6 ( 2/3 ) = - [ 28 ( 5/9 ) + 6 ( 6/9 ) ] = - 34 ( 11/9 ) = - 35 ( 2/9 )
1/2 = 1*3 / 2*3 = 3/6 = 2/6 + 1/6 = 1/3 + 1/6
1/4 = 1*5 / 4*5 = 5/20 = 4/20 + 1/20 = 1/5 + 1/20
1/6 = 1*7 / 6*7 = 7/42 = 6/42 + 1/42 = 1/7 + 1/42
1/8 = 1*9 / 8*9 = 9/72 = 8/72 + 1/72 = 1/9 + 1/72
3089 - х= 1596
х=3089-1596
х=1493
1920:х=16
х=1920:16
х=120
-7/3x+1.8=5.9
-7/3x=5.9-1.8
-7/3x=4.1
-7x=4.1*3
-7x=12.3
x=12.3/(-7)
x=-1 53/70