2.45+3.28+12.19+0.81+6.55+8.72
用简便方法计算.(1)2.45+3.28+12.19+0.81+6.55+8.72(2)13-0.75-6.38-2.25-3.62....
用简便方法计算.
(1)2.45+3.28+12.19+0.81+6.55+8.72
(2)13-0.75-6.38-2.25-3.62. 展开
(1)2.45+3.28+12.19+0.81+6.55+8.72
(2)13-0.75-6.38-2.25-3.62. 展开
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