0.4X-0.4x2.5=2.3-130.4X=-10.7+1X=-9.7/0.4X=-24.25
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解答0.4×-1=-10.7×=-11.7÷0.4×=-117/4
解:0.4(x-2.5)=-10.7x-2.5=-26.75x=-24.25