χ: 21=41:81 21: χ=41:81 3χ+41χ=2132 145:7
5=0.3: χ
131-χ=89.2 31:0.25=80%: χ 4χ+7.1=12.5 43-21χ=5
1
32χ-21χ+51=32 43:53=χ:12 χ-21χ=107 χ:4
3
=12:3
2.4χ-0.45×2=0.3 41:8
1
=χ:0.1 6.3-5χ=4.1 1.25:5=0.75:χ
21:χ=43:6 53×2.5-χ=0.6 χ-61χ=125 31: χ=51:7
6
10x =21.0 32χ-21χ+1.2=3.4 4:6=15:χ 21:43=χ:3
2
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