35/0.8=x/181.42∶0.3=x∶0.45 2.4.2=1/4∶5/8x 3.1/3∶1/20=5/8∶x 4.x∶2/5=2/7∶3 5.x∶0.5=14∶0.6

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35/0.8=x/181.42∶0.3=x∶0.452.4.2=1/4∶5/8x3.1/3∶1/20=5/8∶x4.x∶2/5=2/7∶35.x∶0.5=14∶0.635/0.8=x/181.42∶0

35/0.8=x/181.42∶0.3=x∶0.45 2.4.2=1/4∶5/8x 3.1/3∶1/20=5/8∶x 4.x∶2/5=2/7∶3 5.x∶0.5=14∶0.6
35/0.8=x/18
1.42∶0.3=x∶0.45 2.4.2=1/4∶5/8x 3.1/3∶1/20=5/8∶x 4.x∶2/5=2/7∶3 5.x∶0.5=14∶0.6

35/0.8=x/181.42∶0.3=x∶0.45 2.4.2=1/4∶5/8x 3.1/3∶1/20=5/8∶x 4.x∶2/5=2/7∶3 5.x∶0.5=14∶0.6
35/0.8=x/18
===> 0.8x=35*18
===> x=35*18/0.8
===> x=787.5
42:0.3=x:0.45
===> 0.3x=42*0.45
===> x=42*0.45/0.3
===> x=63
最后一项到底是(5x/8),还是5/(8x)?
(1/3):(1/20)=(5/8):x
===> (1/3)x=(1/20)*(5/8)
===> (1/3)x=1/32
===> x=(1/32)*3
===> x=3/32
x:(2/5)=(2/7):3
===> 3x=(2/7)*(2/5)
===> 3x=4/35
===> x=4/105
x:0.5=14:0.6
===> 0.6x=0.5*14=7
===> x=7/0.6=70/6
===> x=35/3