№7 1 1 1 ; 3 5 15 1 1 13 16 65 + 48 113 8 1) 4 + 3 = + = = =7 ; 3 5 3 5 15 15 15 1 1 б) 17 : (4 − 3 ) = 15 ; 3 5 1 1 13 16 65 − 48 17 2 = =1 ; 1) 4 − 3 = − = 3 5 3 5 15 15 15 2 17 15 17 15 2) 17 :1 = 17 : = 17 ⋅ = ⋅ = 15 ; 15 15 17 1 17 1⎞ ⎛ 2 2⎞ ⎛ в) ⎜ 6 − 7 ⎟ ⋅ ⎜ + ⎟ = −1 ; 8⎠ ⎝9 3⎠ ⎝ 1 6 57 48 − 57 9 1 1) 6 − 7 = − = = − = −1 ; 8 1 8 8 8 8 1 8 9 8 3) −1 ⋅ = − ⋅ = −1 ; 8 9 8 9
а) (4 + 3 ) :113 =
2) 7
2)
8 113 1 1 :113 = ⋅ = ; 15 15 113 15
2 2 2+6 8 + = = ; 9 3 9 9
⎛ ⎝
1 ⎞ ⎛ 14 3⎞ 1 ⎠ ⎝ ⎠ 1 15 33 120 − 33 87 7 1) 15 − 4 = − = = = 10 ; 8 1 8 8 8 8 4 3 59 13 59 − 49 10 2 7 2 87 2 29 1 2) 3 − 2 = − = = = ; 3) 10 ⋅ = ⋅ = =7 . 15 5 15 5 15 15 3 8 3 8 3 4 4
г) ⎜15 − 4 ⎟ ⋅ ⎜ 3 − 2 ⎟ = 7 ; 8 15 5 4
№8 1 1 3 3 1 7 7 7 3 1) 7 : 2 = : = ⋅ = 3 ; 3 1 3 1 7
а) 7 : 2 + 4 :1 = 6; ;
⎛
2
1⎞
4
1 3
2) 4 :1 =
4 4 4 3 : = ⋅ = 3; 1 3 1 4
3) 3 + 3 = 6 ;
4
б) ⎜12 − 6 ⎟ : 7 = ; 5⎠ 3 5 ⎝ 5 2 1 62 31 31 1 1 3 31 31 31 4 4 2) 6 : 7 = : = ⋅ = ; − = =6 ; 5 5 5 5 5 5 5 4 5 4 5 31 5 1 1 5 в) 8 − 4 : 3 = 7 ; 7 7 8 1 5 29 29 29 8 8 1 1 1 1) 4 : 3 = : = ⋅ = = 1 ; 2) 8 − 1 = 7 ; 7 8 7 8 7 29 7 7 7 7
1) 12 − 6 =
3