解方程:(1)6x—0.5x=99 (2)9x—3×1.6=72.6 (3)8x+4.5×3=53.5 (4)3(x+1.9)=7.8

问题描述:

解方程:(1)6x—0.5x=99 (2)9x—3×1.6=72.6 (3)8x+4.5×3=53.5 (4)3(x+1.9)=7.8

(1)6x—0.5x=99 5.5x=99x=99÷5.5x=18(2)9x—3×1.6=72.69x-4.8=72.69x=72.6+4.89x=77.4x=77.4÷9x=8.63)8x+4.5×3=53.5 8x+13.5=53.58x=53.5-13.58x=40x=40÷8x=5(4)3(x+1.9)=7.8x+1.9=7.8÷3x+1.9= 2.6x=...还有呢很简单啊剩下的的也说了,我采纳你你是学生?