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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

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

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