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ǰλãҳ >> 7.5xһ7.5x0.9,0.65 >>

7.5xһ7.5x0.9,0.65

7.5xһ7.5x0.9 7.5x1һ7.5x0.9 =7.5x(1-0.9) =7.5x0.1 =0.75 7.5x1һ7.5x0.65 =7.5x(1-0.65) =7.5x0.35 =2.45

7.5-7.5x0.9 =7.51-0.9 =7.50.1 =0.75

3x0.9

õģƵġ֪ˡ

0.8x7.5x0.9 =2x0.4x2.5x3x0.9 =2x3x1x0.9 =6x0.9 =5.4

⣺810=0.8 10-1.8-7.2=1 0.43+3.57=4 2.5412=120 0.90.8=0.72 7.2899+7.28=728 4.3500.2=43 7.5x-3x=4.5x a+3a+7a=11a 1.05100=105 10.5=2 0.963=0.32 1.470.7=2.1 5.46=0.9 8.80.1=88

ԭʽ =7.5x1-7.5x0.9 =7.5x(1-0.9) =7.5x0.1 =0.75

0.992.5+0.99x7.5 =0.992.5+7.5 =0.9910 =9.9

10.5x-7.5x=0.9 3x=0.9 x=0.3

ȼ7.5*1.4=15*0.7=10.5 10.5*0.9=9.45 Ҳó˷ɺͽɽм㡣

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