几道初一的数学题
(1)4x+3(2x-3)=12-(x+4)(2)6(1/2x-4)+2x=7-(1/3x-1)(3)2(x+8)=3(x-1)(4)8x=-2(x+4)(5)2x-2/...
(1)4x+3(2x-3)=12-(x+4)
(2)6(1/2x-4)+2x=7-(1/3x-1)
(3)2(x+8)=3(x-1)
(4)8x=-2(x+4)
(5)2x-2/3(x+3)=-x+3
(6)2(10-0.5y)=-(1.5y+2)
(7)5a+(2-4a)=0
(8)25b-(b-5)=29
(9)7x+2(3x-3)=20
(10)8y-3(3y+2)=6 展开
(2)6(1/2x-4)+2x=7-(1/3x-1)
(3)2(x+8)=3(x-1)
(4)8x=-2(x+4)
(5)2x-2/3(x+3)=-x+3
(6)2(10-0.5y)=-(1.5y+2)
(7)5a+(2-4a)=0
(8)25b-(b-5)=29
(9)7x+2(3x-3)=20
(10)8y-3(3y+2)=6 展开
2个回答
展开全部
(1)4x+3(2x-3)=12-(x+4),4x+6x-9=12-x-4,11x=17,x=17/11
(2)6(1/2x-4)+2x=7-(1/3x-1),3x-12+2x=7-1/3x+1
16/3x=20,x=20 x3 /16=60/16=15/4
(3)2(x+8)=3(x-1),2x+16=3x-3,x=13
(4)8x=-2(x+4),8x=-2x-8,10x=-8,x=-5/2
(5)2x-2/3(x+3)=-x+3,2x-2/3 x-2=-x+3,7/3 x=5,x=15/7
(6)2(10-0.5y)=-(1.5y+2)20-y=-1.5y-2,0.5y=-22,y=-44
(7)5a+(2-4a)=0,a+2=0,a=-2
(8)25b-(b-5)=29,25b-b+5=29,24b=24,b=1
(9)7x+2(3x-3)=20,7x+6x-6=20,13x=26,x=2
(10)8y-3(3y+2)=6 ,8y-9y-6=6,y=-12
(2)6(1/2x-4)+2x=7-(1/3x-1),3x-12+2x=7-1/3x+1
16/3x=20,x=20 x3 /16=60/16=15/4
(3)2(x+8)=3(x-1),2x+16=3x-3,x=13
(4)8x=-2(x+4),8x=-2x-8,10x=-8,x=-5/2
(5)2x-2/3(x+3)=-x+3,2x-2/3 x-2=-x+3,7/3 x=5,x=15/7
(6)2(10-0.5y)=-(1.5y+2)20-y=-1.5y-2,0.5y=-22,y=-44
(7)5a+(2-4a)=0,a+2=0,a=-2
(8)25b-(b-5)=29,25b-b+5=29,24b=24,b=1
(9)7x+2(3x-3)=20,7x+6x-6=20,13x=26,x=2
(10)8y-3(3y+2)=6 ,8y-9y-6=6,y=-12
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