9.9x34 4/5x1/4+0.25÷5/21-25% 12.5x8.8简便计算
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9.9x34
=（10-0.1）x34
=10x34-0.1x34
=340-3.4
=336.6
4/5x1/4+0.25÷5/21-25%
=4/5x1/4+1/4x21/5-1/4
=（4/5+21/5-1）x1/4
=4x1/4
=1
12.5x8.8
=12.5x8x1.1
=100x1.1
=110
=（10-0.1）x34
=10x34-0.1x34
=340-3.4
=336.6
4/5x1/4+0.25÷5/21-25%
=4/5x1/4+1/4x21/5-1/4
=（4/5+21/5-1）x1/4
=4x1/4
=1
12.5x8.8
=12.5x8x1.1
=100x1.1
=110
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