15.5*8.2-0.72 用递等式计算
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15.5*8.2-0.72用递等式计算15.5*8.2-0.72用递等式计算15.5*8.2-0.72用递等式计算15.5*8.2-0.72=127.1-0.72=126.3815.5*8.2-0.7
15.5*8.2-0.72 用递等式计算
15.5*8.2-0.72 用递等式计算
15.5*8.2-0.72 用递等式计算
15.5*8.2-0.72
=127.1-0.72
=126.38
15.5*8.2-0.72
=(15+0.5)(8+0.2)-0.72
=120+4+3+0.01-0.72
=126.29
15.5*8.2-0.72
=15.5*8+15.5*0.2-0.72
=124+3.1-0.72
=127.1-0.72
=126.38