www.5129.net > 28%x%0.21x=147 解方程

28%x%0.21x=147 解方程

41%x=85 x=8500/41

(1)x+40%x=7 x=7/140%=5 (2)120%x-x=7 x=7/20%=35 (3)x-18%x=8.2 x=8.2/82%=10

3.38x=7.8 x=7.8÷3.38 x=30/13

x-18%x=65.6 解:(1-18%)x=65.6 0.82x=65.6 0.82x÷0.82=65.6÷0.82 x=80

(1)x+20%x=240 1.2x=240 1.2x÷1.2=240÷1.2 x=200(2)20%x-1.8×4=0.8 0.2x-7.2=0.8 0.2x-7.2+7.2=0.8+7.2 0.2x=8 0.2x÷0.2=8÷0.2 x=40(3)125%x+0.15=121.25x+0.15-0.15=0.5-0.15 1.25x=0.35 1.25x÷1.25=0.35÷1.25 x=0.28(4)34x÷47=12. 34...

桃心梅方/K

x+2%x=20.4 x+0.02x=20.4 1.02x=20.4 x=20.4/1.02 x=20 谢谢,请采纳

145-16%x=65 16%x=145-65 16%x=80 x=80/16% x=500

1一40%x=0.7 解:0.4x=1-0.7 0.4x=0.3 x=0.3÷0.4 x=0.75

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