设这个数为x6.4x+2.6=2.5×3.66.4x+2.6=96.4x=9-2.66.4x=6.4x=6.4÷6.4x=1
设这个数为x6.4x+2.6=2.5X3.66.4x=9-2.66.4x=6.4x=1