梯等式计算0.25*2.1+0.25*8.9-0.25

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梯等式计算0.25*2.1+0.25*8.9-0.25

梯等式计算0.25*2.1+0.25*8.9-0.25
梯等式计算0.25*2.1+0.25*8.9-0.25

梯等式计算0.25*2.1+0.25*8.9-0.25
=0.25x(2.1十8.9一1)
=0.25X10
=2.5

=0.25*(2.1+8.9-1)=0.25*10=2.5

0.25×(2.1+8.9)-0.25