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яна535
@яна535
August 2022
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zhenyaM2002
Verified answer
1)
а) = -6,37+9,12 -8,3+6,37 -1,2+8,3= 9,12-1,2= 7,92
б) =-5 2/3 +3 2/7 - 6 11/14 + 1/6= (-5 4/6 +1/6 ) +(-6 11/14 + 3 4/14)=
= -5 3/6 + (-3 7/14) = -5 1/2 - 3 1/2= -9
2)
а)= -36,8mn
б) = -55x - 27y
в) = -а-р+9,3+а-р =9,3-2р
г) =20х-8-27+6х= 26х-35
3)
а) =5/9 * (-6,4+2,8)= 5/9 * (-36/10) = -20/10=-2
б) =-4,7 *(-2,11-7,89)= -4,7* (-10) = 47
4)
а)
-10 +12-3х =-8
2-3х=-8
-3х= -8-2
-3х= -10
х= (-10) : (-3)=10/3
х=3 1/3
проверим:
-10+ 3 (4- 3 1/3) =-8
-10 + 3/1 * 2/3=-8
-10+2=-8
-8=-8
б)
4х-20 -12+2х=10
6х-32=10
6х=10+32
6х=42
х=7
проверим:
4(7-5) -(12-2*7) =10
4*2 - (-2) =10
8+2=10
10=10
5)
= (1/3 а - 1/2 а) + (-4/9 b + 2/3 b) =
= (2/6 a - 3/6 a ) + ( - 4/9 b + 6/9 b) =
= -1/6 a + 2/9 b
при а = 1,2 , b=-18
-1/6 * 1.2 + 2/9 * (-18) =
= - (1/6 * 12/10 ) - (2/9 * 18/1) =
= -0.2 - 4 =-4.2
проверим на полном выражении:
=1/3 * 12/10 - 4/9 * (-18/1) - 1/2 * (12/10) + 2/3 * (-18/1)=
= 0,4 + 8 - 0,6 -12= -4,2 - всё верно
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Answers & Comments
Verified answer
1)а) = -6,37+9,12 -8,3+6,37 -1,2+8,3= 9,12-1,2= 7,92
б) =-5 2/3 +3 2/7 - 6 11/14 + 1/6= (-5 4/6 +1/6 ) +(-6 11/14 + 3 4/14)=
= -5 3/6 + (-3 7/14) = -5 1/2 - 3 1/2= -9
2)
а)= -36,8mn
б) = -55x - 27y
в) = -а-р+9,3+а-р =9,3-2р
г) =20х-8-27+6х= 26х-35
3)
а) =5/9 * (-6,4+2,8)= 5/9 * (-36/10) = -20/10=-2
б) =-4,7 *(-2,11-7,89)= -4,7* (-10) = 47
4)
а)
-10 +12-3х =-8
2-3х=-8
-3х= -8-2
-3х= -10
х= (-10) : (-3)=10/3
х=3 1/3
проверим:
-10+ 3 (4- 3 1/3) =-8
-10 + 3/1 * 2/3=-8
-10+2=-8
-8=-8
б)
4х-20 -12+2х=10
6х-32=10
6х=10+32
6х=42
х=7
проверим:
4(7-5) -(12-2*7) =10
4*2 - (-2) =10
8+2=10
10=10
5)
= (1/3 а - 1/2 а) + (-4/9 b + 2/3 b) =
= (2/6 a - 3/6 a ) + ( - 4/9 b + 6/9 b) =
= -1/6 a + 2/9 b
при а = 1,2 , b=-18
-1/6 * 1.2 + 2/9 * (-18) =
= - (1/6 * 12/10 ) - (2/9 * 18/1) =
= -0.2 - 4 =-4.2
проверим на полном выражении:
=1/3 * 12/10 - 4/9 * (-18/1) - 1/2 * (12/10) + 2/3 * (-18/1)=
= 0,4 + 8 - 0,6 -12= -4,2 - всё верно