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7.5x一7.5x0.9,0.65x2.4一0.65x1.4,12.8+2.04x9....

1,解:原式=7.5x(1-0.9) =7.5x0.1 =0.75 2,解:原式=0.65x(2.4-1.4) =0.65x1 =0.65 3,解:原式=12.8+2.04x(10-0.5) =12.8+2.04x10-2.04x0.5 =12.8+20.4-1.02 =33.2-1.02 =32.18

7.5x一7.5x0.9 7.5x1一7.5x0.9 =7.5x(1-0.9) =7.5x0.1 =0.75 7.5x1一7.5x0.65 =7.5x(1-0.65) =7.5x0.35 =2.45

3x等于0.9

1。14.5+7.65x4+25.5+2.35x4+40 =14.5+29.5+25.5+9.4+40 =80+38.9 =118.9 2。3.5÷(0.7÷0.5) =3.5/1.4 =3.5/(7/5) =4.9 3。(3.6x7.5x0.54)÷(1.2x1.5x0.9) =14.58/1.62 =9

a+0.5= a+0.5 b-0.9b=0.1b 3x+7.5x=10.5x 11x-0.25x=10.75x 如果x—3=n,y—5=n,正确的是: x<y

7.5一7.5x0.9 =7.5x(1-0.9) =7.5x0.1=0.75

7.5一7.5x0.9 =7.5x(1-0.9) =7.5x0.1 =0.75

2.3x+1.7x=8.44 4x=8.44 x=2.11 0.9x-0.4x=20 0.5x=20 x=40 7.5x-7x=12.5 0.5x=12.5 x=25 7x-2x=155 5x=155 x=31 3.5x+2x=16.5 5.5x=16.5 x=3

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