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解方程2.5X%1

(1)2.5X-120%X=6.5, 1.3X=6.5, 1.3X÷1.3=6.5÷1.3, X=5;(2)3X+60%×4=9, 3X+2.4=9, 3X+2.4-2.4=9-2.4, 3X=6.6, 3X÷3=6.6÷3, X=2.2.

如图

解:x=2.5-1.58=0.92

x÷1.2=2.5 x=1.2X2.5 x=0.3x4x2.5 x=0.3x10 x=3

①2.5x-1.3x=24, 1.2x=24, 1.2x÷1.2=24÷1.2, x=20;② 3 8 x=20, 3 8 x÷ 3 8 =20÷ 3 8 , x= 160 3 ;③x+3.8x=12, 4.8x=12,4.8x÷4.8=12÷4.8, x=2.5;把x=2.5代入原方程,左边=2.5+3.8×2.5=2.5+9.5=12,右边=12,左边=右边,所以,x=2.5是...

(1)3.6-9x=0.9,3.6-9x+9x-0.9=0.9-0.9+9x,9x=2.7,x=0.3;(2)13.4+2.5x=18.4,13.4-13.4+2.5x=18.4-13.4,2.5x=5,x=2;(3)4(0.9-X)=2.2,0.9-x=0.55,x=0.35;(4)1.8(4.7+x)=19.8,4.7+x=11,x=6.3;(5)(x+1.8)÷8=6.6,x+1.8...

x+2/9=5/6 x=5/6-2/9 =15/18-4/18 =11/18 2.5X+1=6.5 2.5x=6.5-1=5.5 x=5.5/2.5 =2.2

化简: (2.5-1.3)X=3 X=3/(2.5-1.3) X=2.5

2.5-1.58=x x=0.92

(1)解:去括号得:2x+2=-3x+12,移项合并得:5x=10,解得:x=2;(2)解:方程变形为5x?152-10x+205=2.5,去分母得:5(5x-15)-2(10x+20)=25,去括号得:25x-75-20x-40=25,移项合并得:5x=140,解得:x=28.

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