(3/4)-(1/2)+(+3/4)+(-8.5) 求解?
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(3/4)-(1/2)+(+3/4)+(-8.5) 求解?
![(3/4)-(1/2)+(+3/4)+(-8.5) 求解?](/uploads/image/z/7707486-30-6.jpg?t=%EF%BC%883%2F4%EF%BC%89-%EF%BC%881%2F2%EF%BC%89%2B%EF%BC%88%2B3%2F4%EF%BC%89%2B%EF%BC%88-8.5%EF%BC%89+%E6%B1%82%E8%A7%A3%3F)
(3/4)-(1/2)+(+3/4)+(-8.5)
=0.75-0.5+0.75-8.5
=(0.75+0.75)-(0.5+8.5)
=1.5-9
=-7.5 再答: 求好评
再问: (0.4分之x-3)-(0.5分之x-2)-2.5 求解??
再答: (0.4分之x-3)-(0.5分之x-2)-2.5 =0.025x-3-0.02x+2-2.5 =(0.025x-0.02x)+(2-3-2.5) =0.005x-3.5
再问: y²+2y=1
=0.75-0.5+0.75-8.5
=(0.75+0.75)-(0.5+8.5)
=1.5-9
=-7.5 再答: 求好评
再问: (0.4分之x-3)-(0.5分之x-2)-2.5 求解??
再答: (0.4分之x-3)-(0.5分之x-2)-2.5 =0.025x-3-0.02x+2-2.5 =(0.025x-0.02x)+(2-3-2.5) =0.005x-3.5
再问: y²+2y=1