2.5×1.6×0.25
=(2.5x4)x(0.4x0.25 )
=10x0.1
=1
1.01×9.8
=(1+0.01)X9.8
=1x9.8+0.01x9.8
=9.8+0.098
=9.898
8.88×12.5
=1.11x(8x12.5)
=1.11x100
=111
一.递等式：2.5×1.6×0.25 1.01×9.8 8.88×12.5
1个回答
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