25×1点二五×32乘98%用简便算法计算

25×1点二五×32乘98%用简便算法计算

25×1点二五×32乘98%
=25×1.25×32x98%
=25×1.25×4x8x98%
=25×4×1.25x8x98%
=(25×4)×(1.25x8)x98%
=100x10x98%
=1000x98%
=980
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