神马作文网几道数学解方程和简便运算
来源：学生作业帮 编辑：神马作文网作业帮 分类：数学作业 时间：2024/11/11 05:42:57
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
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
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
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