去括号:(1)1-(a^2-2ab+b^2) (2)x-3(4-2y) (3)4a-3(2b+c)
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去括号:(1)1-(a^2-2ab+b^2) (2)x-3(4-2y) (3)4a-3(2b+c)
(4)p+4/5(10-15a) (5)-7(b-4ac)+1/2(-3-5a) (6)-(a-b)-3(c+3/5d)
去括号,并合并同类项.
(1)-4x-(x-1) (2)m+(2m-n)-(3m+2n) (3)1/3(3-5a)-4(a/3-1)
(4)3(ab-2c)+(-ab+3c) (5)7(p-2q)-2(3p-7q) (6)2/5π(5R^2-r^2)-3/5π r^2
(7)6x-[5x+(3x-1)] (8)1-(3ab+a)+[-(2a-3ab)] (9)4(xyz-2xy)-(xyz-3z)+3(2xy-z)
(4)p+4/5(10-15a) (5)-7(b-4ac)+1/2(-3-5a) (6)-(a-b)-3(c+3/5d)
去括号,并合并同类项.
(1)-4x-(x-1) (2)m+(2m-n)-(3m+2n) (3)1/3(3-5a)-4(a/3-1)
(4)3(ab-2c)+(-ab+3c) (5)7(p-2q)-2(3p-7q) (6)2/5π(5R^2-r^2)-3/5π r^2
(7)6x-[5x+(3x-1)] (8)1-(3ab+a)+[-(2a-3ab)] (9)4(xyz-2xy)-(xyz-3z)+3(2xy-z)
![去括号:(1)1-(a^2-2ab+b^2) (2)x-3(4-2y) (3)4a-3(2b+c)](/uploads/image/z/4801688-8-8.jpg?t=%E5%8E%BB%E6%8B%AC%E5%8F%B7%EF%BC%9A%EF%BC%881%EF%BC%891-%28a%5E2-2ab%2Bb%5E2%29+%282%29x-3%284-2y%29+%283%294a-3%282b%2Bc%29)
(1)1-(a^2-2ab+b^2)=1-a^2+2ab-b^2)
(2)x-3(4-2y)=x-12+6y (3)4a-3(2b+c)=4a-6b-3c
(4)p+4/5(10-15a)=p+8-12a
(5)-7(b-4ac)+1/2(-3-5a)=-7b+28ac-3/2-5/2a
(6)-(a-b)-3(c+3/5d)=-a+b-3c-9/5d
(1)-4x-(x-1)=-5x+1 (2)m+(2m-n)-(3m+2n)=-3n
(3)1/3(3-5a)-4(a/3-1)=1-5/3a-4a/3+4=5-3a
(4)3(ab-2c)+(-ab+3c)=2ab-3c (5)7(p-2q)-2(3p-7q)=p
(6)2/5π(5R^2-r^2)-3/5π r^2=2π R^2-2πr^2-3/5π r^2=2π R^2-3/5πr^2
(7)6x-[5x+(3x-1)]=6x-(8x-1)=-2x+1
(8)1-(3ab+a)+[-(2a-3ab)]= 1-(3ab+a)+(-2a+3ab)= 1-3a
(9)4(xyz-2xy)-(xyz-3z)+3(2xy-z)=3xyz+2xy
(2)x-3(4-2y)=x-12+6y (3)4a-3(2b+c)=4a-6b-3c
(4)p+4/5(10-15a)=p+8-12a
(5)-7(b-4ac)+1/2(-3-5a)=-7b+28ac-3/2-5/2a
(6)-(a-b)-3(c+3/5d)=-a+b-3c-9/5d
(1)-4x-(x-1)=-5x+1 (2)m+(2m-n)-(3m+2n)=-3n
(3)1/3(3-5a)-4(a/3-1)=1-5/3a-4a/3+4=5-3a
(4)3(ab-2c)+(-ab+3c)=2ab-3c (5)7(p-2q)-2(3p-7q)=p
(6)2/5π(5R^2-r^2)-3/5π r^2=2π R^2-2πr^2-3/5π r^2=2π R^2-3/5πr^2
(7)6x-[5x+(3x-1)]=6x-(8x-1)=-2x+1
(8)1-(3ab+a)+[-(2a-3ab)]= 1-(3ab+a)+(-2a+3ab)= 1-3a
(9)4(xyz-2xy)-(xyz-3z)+3(2xy-z)=3xyz+2xy
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