35%x+85%x=9 用方程解
问题描述:
35%x+85%x=9 用方程解
越快越好
答
35%x+85%x=9
(35%+85%)x=9
120%x=9
x=900/120
x=90/12
x=15/21.8-3/5x=3/10这道题也帮帮我1.8-3/5x=3/10-0.6x=0.3-1.8-0.6x=-1.5x=15/6x=5/2%8/25×(2/3+1/4)÷11/15=3/4+(5/6-2/3)×9/10=(0.75-7/20)÷(1/4+0.15﹚=(1/2-1/3×75%)÷25%=这是简便计算的题,帮帮我3/4+(5/6-2/3)×9/10=3/4+1/6×9/10=3/4+3/20=15/20+3/20=18/20=9/10(0.75-7/20)÷(1/4+0.15﹚=(0.75-0.35)÷(0.25+0.15﹚=0.4÷0.4=1(1/2-1/3×75%)÷25%=(1/2-1/3×3/4)÷1/4=(1/2-1/4)×4=2-1=1