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解方程0.2(5x一1)十5(x一1)=0.8

解方程 0.2(5x一1)十5(x一1)=0.8 x-0.2+5x-5=0.8 6x-0.2-5=0.8 6x=0.8+0.2+5 6x=6 x=1

(1)0.8x-0.5x=1.2 0.3x=1.2 0.3x÷0.3=1.2÷0.3 x=4;检验:把x=4代入原方程,左边=0.8×4-0.5×4=3.2-2=1.2,右边=1.2,因为左边=右边,所以x=4是原方程的解.(2)3×1.5+4x=14.5 4.5+4x=14.5 4.5+4x-4.5=14.5-4.5 4x=10 4x÷4=10÷4 x=2.5;检验:...

5x=0.8+0.9-1.2=0.5 x=0.1

5x-1/3=1/2 5x=1/2+1/3 5x=5/6 x=5/6*1/5 x=1/6 (1-5/8)x=10 x=10÷3/8 x=10*8/3 x=80/3 8-(3/4+2/3x)=0 8-3/4-2x/3=0 2x/3=29/4 x=29/4*3/2 x=87/8 1/5×8÷x=5/8 8/5x=5/8 25x=64 x=64/25

(1)x2-5x=0,x(x-5)=0,x1=0,x2=5;(2)(2x+1)2=4,2x+1=±2,2x+1=2或2x+1=-2,x1=12,x2=?32;(3)x(x-1)+3(x-1)=0(x-1)(x+3)=0x-1=0或x+3=0x1=1,x2=-3;(4)x2-2x-8=0(x+2)(x-4)=0x+2=0或x-4=0x1=-2,x2=4;

(1)5x-5×14=0.8 5x-1.25=0.8 5x-1.25+1.25=0.8+1.25 5x=2.05 5x÷5=2.05÷5 x=0.41(2)49:0.8=x3.6?1.2 0.8x=49×(3.6-1.2) 0.8x÷45=1615÷45 x=43

(1)5.4+2x=8.6, 5.4+2x-5.4=8.6-5.4, 2x=3.2, 2x÷2=3.2÷2, x=1.6;(2)2.5:5=x:8, 5x=2.5×8, 5x=20, 5x÷5=20÷5, x=4;(3)0.2=1-x24, 0.2+x24=1-x24+x24, 0.2+x24=1,0.2-0.2+x24=1-0.2, x24=0.8, x=0.8×24, x=19.2;(4)34...

你化错了. 应该是 1 0 0 1 0 1 0 2 0 0 1 1 0 0 0 0

(1)(x+1)2-4=0,移项得,(x+1)2=4,∴x+1=2或x+1=-2,解得:x1=1,x2=-3;(2)3(x-2)=5x(x-2),移项得,3(x-2)-5x(x-2)=0,因式分解得,(x-2)(5x-3)=0,解得:x1=2,x2=35;(3)2x2-5x+1=0,a=2,b=-5,c=1,△=b2-4ac=25-8=1...

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