已知x-5y=-3,则15-2x+10y

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已知x-5y=-3,则15-2x+10y
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已知x-5y=-3,则15-2x+10y
已知x-5y=-3,则15-2x+10y

已知x-5y=-3,则15-2x+10y
15-2x+10y
=15-2(x-5y)
=15-2*(-3)
=21

15-2x+10y
=-2(x-5y)+15
=-2×(-3)+15
=6+15
=21

因为 x-5y=-3
所以 15-2x+10y=15-2*(x-5y)
=15-2*(-3)
=21

15-2x+10y
=15-2(x-5y)
=15-2*(-3)
=15+6=21

15-2x+10y=15-2(x-5y)
∵x-5y=-3
∴15-2(x-5y)=15-2*(-3)=21

15-2x+10y
=15-2(x-5y)
=15-2*(-3)
=21