几道数学解方程和简便运算1.0.8:x=4/3 :0.22.(1/4 x+0.33)÷1/5=19.53.2.5×0.875+0.25×1.254.999 8/9+99 8/9+9 8/9+ 1/35.2.5-5/12-1/6÷2/7
来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/27 11:03:45
几道数学解方程和简便运算1.0.8:x=4/3 :0.22.(1/4 x+0.33)÷1/5=19.53.2.5×0.875+0.25×1.254.999 8/9+99 8/9+9 8/9+ 1/35.2.5-5/12-1/6÷2/7
几道数学解方程和简便运算
1.0.8:x=4/3 :0.2
2.(1/4 x+0.33)÷1/5=19.5
3.2.5×0.875+0.25×1.25
4.999 8/9+99 8/9+9 8/9+ 1/3
5.2.5-5/12-1/6÷2/7
几道数学解方程和简便运算1.0.8:x=4/3 :0.22.(1/4 x+0.33)÷1/5=19.53.2.5×0.875+0.25×1.254.999 8/9+99 8/9+9 8/9+ 1/35.2.5-5/12-1/6÷2/7
1.0.8:x=4/3 :0.2
4x/3=0.8*0.2
4x/3=0.16
x=0.16*3/4
x=0.12
2.(1/4 x+0.33)÷1/5=19.5
(1/4x+0.33)=19.5×1/5
1/4x+0.33=3.9
1/4x=3.9-0.33
1/4x=3.57
x=3.57×4
x=14.28
3.2.5×0.875+0.25×1.25
=0.25×8.75+0.25×1.25
=0.25×(8.75+1.25)
=0.25×10
=2.5
4.999 8/9+99 8/9+9 8/9+ 1/3
=5000-1/9+100-1/9+10-1/9+1/3
=5000+100+10-1/9-1/9-1/9+1/3
=5110
5.2.5-5/12-1/6÷2/7
=2.5-5/12-7/12
=2.5-(5/12+7/12)
=2.5-1
=1.5
1. x=0.12
2. x=14.28
3. 2.5 2.5*(0.875+0.125)
4. 1110-1/9-1/9-1/9+1/3=1110
5. 2.5-5/12-7/12=2.5-1=1.5
希望能帮到你
1.x*4/3=0.8*0.2
x=0.16*3/4=0.12
2.1/4 x+0.33=19.5*5=97.5
1/4 x=97.17 ,x=388.68
3.0.25×8.75+0.25×1.25=(8.75+1.25)0.25×=2.5
4.8/9(999+99+9)+1/3=984 1/3
5. 2.5-5/12-7/12= 2.5-1=1.5
1、0.8:x=4/3 :0.2
8:10x=4/3×10/2
8/10x=20/3
100x=12
x=0.12
2。(1/4 x+0.33)÷1/5=19.5
(1/4 x+0.33)×5=19.5
(1/4 x+0.33)×5×100=19.5×100
125x+165=1950
125x=1950-165
...
全部展开
1、0.8:x=4/3 :0.2
8:10x=4/3×10/2
8/10x=20/3
100x=12
x=0.12
2。(1/4 x+0.33)÷1/5=19.5
(1/4 x+0.33)×5=19.5
(1/4 x+0.33)×5×100=19.5×100
125x+165=1950
125x=1950-165
125x=1785
x=14.28
3、2.5×0.875+0.25×1.25
=0,25×8.75+0.25×1.25
=0.25×(8,75+1.25)
=0,25×10
=2.5
4、999 8/9+99 8/9+9 8/9+ 1/3
=999+8/9+99+8/9+9+8/9+1/3
=(8/9+8/9+8/9+1/3)+999+99+9
=3+999+99+9
=(999+1)+(99+1)+(9+1)
=1000+100+10
=1110
5、2.5-5/12-1/6÷2/7
=5/2-5/12-1/6×7/2
=5/2-5/12-7/12
=5/2-(5/12+7/12)
=5/2-1
=1.5
收起