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解方程活接比例:%3x+6=8 2(x%3)+9(x%3)%4(x%3...

-3x+6=8 -3x=8-6 x=-2/3 2(x-3)+9(x-3)-4(x-3)=0 7(x-3)=0 x-3=0 x=3 x:3/5=2:13 13x=3/5×2 x=6/65 x-0.8x-60=16 0.2x=60+16 x=76÷0.2 x=380 -0.4x+0.1=-0.5x+0.2 -0.4x+0.5x=0.2-0.1 0.1x=0.1 x=1 x+1/3-x-2/6=4-x/2-1 乘以12得 4(x+1)...

0.2×(3x-5)+3=0.4×(x-2)+4 0.6x-1+3=0.4x-0.8+4 0.2x=1.2 x=6

:3(3-x)+6=2(x+3)-8 即9-3x+6=2x+6-8 即15-3x=2x-2 即17=5x x=17/5 不懂可以追问,谢谢!

D=|2,2,-1,1| 4,3,-1,2 8,3,-3,4 3,3,-2,-2 =-28 D1=|(4,2,-1,1)(16,3,-1,2)(12,3-3,4)(6,3,-2,-2)|=-148 D2=|(2,4,-1,1)(4,16,-1,2)(8,12,-3,4)(3,6,-2,-2)|=-84 D3=|(2,2,4,1)(4,3,16,1)(8,3,12,4)(3,3,6,-2)|=-308 D4=|(2,2,-1,4)(4,3,-1,16)...

等价穷替换:lim(x→0)(tan2x-sin3x)/x=lim(x→0) tan2x/x - lim(x→0) sin3x/x=lim(x→0) 2x/x - lim(x→0) 3x/x=2-3=-

①3x=2/3一1/6 3x=1/2 x=1/6 ②x+0.8x=99 1.8x=99 x=55 ③=2/3x4/9+6/5X4/9 =8/27+24/45 =112/135

(1)9=(2x+1)2,变形得:(2x+1)2=9,开方得:2x+1=3或2x+1=-3,解得:x1=1,x2=-2;(2)x2-4x-3=0,移项得:x2-4x=3,配方得:x2-4x+4=7,即(x-2)2=7,可得x-2=±7,∴x1=2+7,x2=2-7;(3)3x2-7x-6=0,因式分解得:(3x+2)(x-3)=0,...

(1)移项得,2x-5x=1,合并同类项得,-3x=1,化系数为1得,x=- 1 3 ;(2)去括号得,8x+12=8-5x+10,移项得,8x+5x=8+10-12,合并同类项得,13x=6,化系数为1得,x= 6 13 ;(3)去分母得,2(2x-5)=3(3-x)-12,去括号得,4x-10=9-3x-12,...

答: 1) 4(x+1)²=k 2(x+1)=±√k x+1=±(√k) /2 x=-1±(√k) /2 2) 2x²+3x=1 2(x²+3x/2+9/4)=1+9/2 2(x+3/2)²=11/2 (x+3/2)²=11/4 x+3/2=±√11/2 x=(-3±√11)/2 3) 3x²-2=4x 3x²-4x=2 3(x²-4x/3+4/9)=2+4/3 3...

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