解方程:1.60%+25=40 2.X-10%X=18 3.x+30%X=52 4.(1-25%)X=36
问题描述:
解方程:1.60%+25=40 2.X-10%X=18 3.x+30%X=52 4.(1-25%)X=36
答
(1) 9 (2) 20 (3) 40 (4) 48
答
(1)60%X+25=40.6X=4-25=-21X=-21/0.6=-35(2)X-10%X=18X-0.1X=18(1-0.1)X=18X=18/(1-0.1)=20(3)X+30%X=52X+0.3X=52(1+0.3)X=52X=52/(1+0.3)=40(4)(1-25%)X=36(1-0.25)X=360.75X=36X=36/0.75=48