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1: 3ï¼8 xï¼25%x=4 2: x÷4=30% 3: 3x+20%x=112 4: x-40%x=3.6
解: ï¹3ï¼8ï¼25%ï¹x=4 x=30%Ã4 3·2 x=112 60%x=3·6
1ï¼8x =4 x=1.2 x=35 x=6
x=32
5: 14%x-9.1=0.7 6: 75%x-25%x=16 7: x-20%x=44Ã50% 8: x-10%=18
14%x=9.8 0.5x=160. 0. 8x=22 0.9 x=18
x=70 x=32 x=27.5 x=20
9 :60%x+25=40 10: 2x+30%x=9.2 11: 1÷x=85% 12;40%x-5ï¼12=3ï¼4
0.6x=15 2.3x=9.2 x=1÷0.85 解 ï¼ 0.4 x=3ï¼4+5/12
x=25 x=4 x=20ï¼17 x=7/6÷2/5
x=35/12
13: 2ï¹x+7ï¹-3.6=20.8 14 :x-5.5=3.5-x 15:160Ã25%-1.3x=17.9 16: 3/8÷x=4/15÷4/9
解 2ï¹x+7ï¹=24.4 2x=3.5+5.5 1.3x=40-17.9 3/8÷x=3/5
x+7=12.2 2x=9 1.3x=22.1 x=3/8÷3/5
x=5.2 x=4.5 x=17 x=5/8
17: x÷2/7=7/3÷3/8 18: 3/4 x+1/2 x=45Ã1/3 19: 0.18Ã3-2x=0.5 20: 0.6÷35%=1/5÷x
x÷2/7=56/9 1.25x=15 2x=0.54-0.5 1/5÷x=12/7
x=56/9Ã2/7 x=15÷1.25 x=0.04÷2 x=1/5÷12/7
x=16/9 x=12 x=0.02 x=7/60
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