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(X+5.8)3=7.5

(x+5.8)÷3=7.5 x+5.8=22.5 x=22.5-5.8 x=16.7

5.8—x=3.7 5.8-x+x=3.7+x 5.8=3.7+x 5.8-3.7=3.7-3.7+x x=2.1

2(X-3)=5.8 解:2(X-3)÷2=5.8÷2 X-3=2.9 X-3+3=2.9+3 X=5.9

2(x-3)=5.8 2x-6=5.8 2x=6+5.8 2x=11.8 x=11.8/2 x=5.9

5.8x2.4+5.8x7.5+0.58 =5.8x(2.4+7.5+0.1) =5.8x10 =58

3.7x5.8+64x0.58-0.58 =3.7x5.8+6.4x5.8-0.1x5.8 =(3.7+6.4-0.1)x5.8 =10x5.8 =58

5.8x3表示(5.8个3或者3个5.8),5.8x0.3表示(5.8个0.3或者0.3个5.8) 请采纳正确答案,你们只提问,不采纳正确答案,回答都没有劲!谢谢管理员推荐采纳!! 朋友,请【采纳答案】,您的采纳是我答题的动力,如果没有明白,请追问。谢谢。

2.5x=20 x=20/2.5=8

26.1+4.5+4.5×3.2+4.5=26.1+4.5+14.4+4.5=30.6+18.9=49.5

4(x-0.3)

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