ldcf.net
当前位置:首页 >> 7.2x0.15怎么算 >>

7.2x0.15怎么算

15.7*0.2-5.7*0.2 =0.2*(15.7-5.7) =0.2*10 =2

15.7x0.2一5.7x0.2 =(15.7-5.7)×0.2 =10×0.2 =2

7.2x1.6+0.8 =(7.2x2+1)x0.8 =15.4x(1-0.2) =15.4-3.08 =12.32

=-25+74一18 =31

=(2x3x2)x(3x7)x(5x3x3)x(2x5.1) 除以 (3x5)x(2x2)x0.7x51 =54

你好, 5x=15-7.2=7.8 x =7.8/5=1.56

(1)15(x?15)=?1?13(x+7),去分母得3(x-15)=-15-5(x+7),∴3x-45=-15-5x-35,∴x=58;(2)x0.5?0.4x?0.60.2=2(?x+3),方程变形为10x5?4x?62=2(?x+3),去分母得20x-20x+30=-2x+6,∴x=-12.

3.14x43+7.2x31.4-150x0.314 =3.14x43+72x3.14-15x3.14 =3.14x(43+72-15) =3.14x100 =314

(1)x(3x-7)=2(3x-7),移项得:x(3x-7)-2(3x-7)=0,(3x-7)(x-2)=0,∴3x-7=0,x-2=0,解方程得:x 1 = 7 3 ,x 2 =2,∴方程的解是x 1 = 7 3 ,x 2 =2.(2)(x-5) 2 -2(x-5)-15=0,(x-5-5)(x-5+3)=0,∴x-10=0,x-2=0,解方...

你好!能把原题附上吗? 单纯的看你这个解题的意思,小瓶原有2(x-0.2)/3升,应该是大瓶去掉0.2升之后小瓶是大瓶的2/3 或者说小瓶比大瓶的2/3少0.4升

网站首页 | 网站地图
All rights reserved Powered by www.ldcf.net
copyright ©right 2010-2021。
内容来自网络,如有侵犯请联系客服。zhit325@qq.com