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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....

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

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

⣺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

112x=95-x13 12x=9513?13x 12x+13x=953 56x=953 56x56=95356 x=3827.5x=2.50.9 2.5x=7.50.9 2.5x=6.75 2.5x2.5=6.752.5 x=2.7

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