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5x+0.3x2=5.6

1,12.5x1.2 =12.5x4x0.3 =50x0.3 =15 2,11.1x66.6+33.3x77.8 =33.3x(11.1x2+77.8) =33.3x(22.2+77.8) =33.3x100 =3330 3,9.9x5.6+0.56 =99x0.56+0.56 =(99+1)x0.56 =100x0.56 =56

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