简便运算2.5*88.9-0.25*8.9
2.5*88.9-0.25*8.9
0.25*73.8+0.125*52.4
0.25*78.9+2.5*2.11
2.5×88.9-0.25×8.9
=2.5×(88.9-0.89)
=2.5×88.01
=220.025
0.25×73.8+0.125×52.4
=0.25×(73.8+0.5×52.4)
=0.25×(73.8+26.2)
=0.25×100
=25
0.25×78.9+2.5×2.11
=0.25×(78.9+21.1)
=0.25×100
=25
合并同类项。
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