作业帮1.4*2.5-0.2x=1.7
来源：学生作业帮助网 编辑：作业帮 时间：2024/04/27 20:48:28
原方程可化为(X+4)/(1/5)-(X-3)/(1/2)=1.4即:5(X+4)-2(X-3)=1.45X+20-2X+6=1.43X=-24.6X=-8.2
0.5✘=0.2✘=0.4
1.(x+7/x+6)+(x+9/+x+8)=(x+10/x+9)+(x+6/x+5)(x+9/+x+8)-(x+10/x+9)=(x+6/x+5)-(x+7/x+6)(((x+9)^2-(x+8)(
19.8x+0.2x=2.5×2⇒ (19.8+0.2)X=5⇒ 20X=5⇒ X=0.25
0.2x+0.4x=120.6x=12x=12÷0.6x=2020x+x=42021x=420x=420÷21x=20
1.解方程0.6x=2.52X=2.52÷0.6x=4.2x-0.15x=5.10.85x=5.1X=5.1÷0.85x=62.5x+7x=199.5x=19X=19÷9.5x=22.（1）设x小时后
当然能算出来X-X×0.2=1.18（1-0.2）X=1.180.8X=1.18解得X=1.475
1.（2x+1)²=2（2x+1)（2x+1)²-2（2x+1)=0(2x+1)(2x+1-2)=0(2x+1)(2x-1)=02.5x(x-2)=3(x-2)(x-2)(5x-3
x=9.8/(1.4-1)=24.5
3.5x×1.4=11.94.9x=11.9x=119/49x=17/7
1.4-2.5x=0.5x3x=1.4x=1.4/3x=7/15x=_7_15
x-0.2x=800.8X=80X=100在右上角点击【评价】,然后就可以选择【满意,问题已经完美解决】了.
3x+0.5x=4.23.5x=4.2x=4.2÷3.5x=1.24x-2.16=1.24x=3.36x=0.84x-0.2x=160.8x=16x=202x-4x乘以2.5=3.62x-10=3.6
1.9/x+x=6,x^2+9=6x,x^2-6x+9=0,(x-3)^2=0,x=3.2.(x+1)/x+2x/(x+1)=3两边同乘以x（x+1)2x^2+(x+1)^2=3*x*(x+1)2x^
8x-4x=0.644x=0.64x=0.64÷4x=0.160.2x-x=416-0.8x=416x=416÷(-0.8)x=-5207x+2.5x=3.89.5x=3.8x=3.8÷9.5x=0.
7x+3*1.4x=0.2*567X+4.2X=11.211.2X=11.2X=1
再回答一次0.2分之0.1x+0.3+2.5=0.5分之0.4x-1(0.1x+0.3)/0.2+2.5=(0.4x-1)/0.5(x+3)/2+2.5=(4x+10)/5等式左右同乘105x+15+
(1)2x-0.8×2.6=3.08-2x4x-2.08-3.08=04x-5.08=0x=1.27(2)2.4×0.2x=0.5x-2.44.8x-0.5x=2.44.3x=2.4x=24/43(3
5(x-4)-5/2=20(x-3)第一个分子分母同时乘以5,第二个小数化分数,第三个乘以205x-20-5/2=20x-60-15x=-37.5∴x=2.5
(1)3x(x+0.2)=4x(x-1.1)3x+0.6=4x-4.44x-3x=0.6+4.4x=5(2)乘以0.8得4(1-x)=3x4-4x=3x4=7xx=4/7（7分之4）（3）1.1x1.