解比例.15:x=0.2:44
解比例.15:x=0.2:44320:18%=6.5x48-(1.08+0.12)x=45.6....
解比例.15:x=0.2:44 3 20 :18%= 6.5 x 48-(1.08+0.12)x=45.6.
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(1)15:x=0.2:44 0.2x=15×44 0.2x=660 0.2x÷0.2=660÷0.2 x=3300; (2)
x=7.8; (3)48-(1.08+0.12)x=45.6 48-1.2x=45.6 48-1.2x+1.2x=45.6+1.2x 1.2x+45.6=48 1.2x+45.6-45.6=48-45.6 1.2x=2.4 1.2x÷1.2=2.4÷1.2 x=2. |
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