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3.5x十1.7x十22.5解方程

3.5x-7=0.5x+11 3x=18 x=6 【精】 【锐】

x十3·7X十2=16·|的解是什么?

(1)2(x+1.7)=9.2, 2(x+1.7)=9.2÷2, x+1.7=4.6,x+1.7-1.7=4.6-1.7x=2.9;(2)8x-4x=0.64, 4x=0.64,, 4x÷4=0.64÷4,x=0.16; (3)2x-0.24=0.12,2x-0.24+0.24=0.24+0.12, 2x=0.36, 2x÷2=0.36÷2x=0.18;(4)6.2x-x=416, 5.2x=41...

解: x-[(2/5)+(7/10)]=1/6 x-{(2×2)/(5×2)]+(7/10)}=1/6 x-[(4/10)+(7/10)]=1/6 x-[(4+11)/10=1/6 x-(15/10)=1/6 x-[(15÷5)/(10÷5)]=1/6 x-(3/2)=1/6 x-(3/2)+(3/2)=(1/6)+(3/2) x=(1/6)+(3/2) x=(1/6)+[(3×3)/(2×3)] x=(1/6)+(9/6) x=(1+9)/6 ...

①1/3:x=2/5 x=1/3÷2/5=1/3×5/2=5/6 ②x:9/7=4/3:9/2 x=(9/7×4/3)÷9/2=36/21×2/9=8/21 ③(x-2):1=x:2 2(x-2)=x 2x-4=x x=4

x/5+x/7=1/12 解:7x/35+5x/35=1/12 12x/35=1/12 x=1/12*35/12 x=35/144

十分之7+2分之1-x=8分之五(通分) 28+20-40x=25 40x=23 x=23/40

6x÷2+(x+4)×4÷2=(6+4)×4÷2 6x+(x+4)*4=40 6x+4x+16=40 10x=40-16 10x=24 x=2.4 (3-10/7﹚÷1/2×2/5 =(3-10/7)*2*2/5 =(3-10/1*4/5 =3*4/5-10/7*4/5 =12/5-8/7 =84/35-40/35 =44/35 =1又35分之9

(1)1.2x+2.6=11 1.2x+2.6-2.6=11-2.6 1.2x=8.4 1.2x÷1.2=8.4÷1.2 x=7(2)3x+4x=133 (3+4)x=133 7x=133 7x÷7=133÷7 x=19(3)10x-6.5x=10.5 (10-6.5)x=10.5 3.5x=10.5 3.5x÷3.5=10.5÷3.5 x=3(4)x+4.9=13.5 x+4.9-4.9=13.5-4.9 x=8.6(5...

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