(1+0.28+0.84)×(0.28+0.84+0.66)-(1+0.28+0.84+0.66)×(0.28+0.84
1个回答

=(1+0.28+0.84)×(0.28+0.84+0.66)-(1+0.28+0.84)×(0.28+0.84)-0.66×(0.28+0.84)

=(1+0.28+0.84)×(0.28+0.84+0.66-0.28-0.84)-0.66×(0.28+0.84)

=(1+0.28+0.84)×0.66-0.66×(0.28+0.84)

=(1+0.28+0.84-0.28-0.84)×0.66

=0.66