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ǰλãҳ >> 7.5xһ7.5x0.9,0.65x2.4һ0.65x1.4,12.8+2.04x9.... >>

7.5xһ7.5x0.9,0.65x2.4һ0.65x1.4,12.8+2.04x9....

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

⣺ԭʽ=7.52.1+7.8x7.9 =7.52.1+7.5+0.3x7.9 =7.52.1+7.5x7.9+0.3x7.9 =7.52.1+7.9+0.3x8-0.1 =75+2.4-0.03 =77.37

3x0.9

114.5+7.65x4+25.5+2.35x4+40 =14.5+29.5+25.5+9.4+40 =80+38.9 =118.9 23.5£0.70.5 =3.5/1.4 =3.5/7/5 =4.9 33.6x7.5x0.54£1.2x1.5x0.9 =14.58/1.62 =9

7.5һ7.5x0.9 =7.5x(1-0.9) =7.5x0.1 =0.75

2.3x1.7x8.44 4x=8.44 x=2.11 0.9x0.4x20 0.5x=20 x=40 7.5x7x12.5 0.5x=12.5 x=25 7x2x155 5x=155 x=31 3.5x2x16.5 5.5x=16.5 x=3

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