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2.7X0.99用简便计算

2.7*0.99 =2.7x(1-0.01) = 2.7-0.027 = 2.673

0.99x1.3-0.11x2.7 = 0.99x1.3-0.99x0.3 = 0.99x(1.3-0.3) = 0.99x1 = 0.99

0.99x1.3-0.11x2.7 =0.99x1.3-0.99x0.3 =0.99×(1.3-0.3) =0.99

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