-①4.1x+221.4=4.25x+216 ②43-2(5+3)=3+6(x-1) ③27=x2[19+(20-x)] ④3(3x-2)=10-0.5(x+3.5)

5. 4x+6=22-12x 6. 5.5x+21-x=50-4.5x-11 7. 2(3x-4)+7(4-x)=4x 8. 19x-3(5x-3)=73 9. 40-3x=52-6x 10. 28-(7+5x)=4+2(2+4x)
以上10题要写出解答过程

第1个回答  2012-08-11
4.1x+221.4=4.25x+216
0.15x=5.4
x=3.6
②43-2(5+3)=3+6(x-1)
27=6x-3
x=5本回答被提问者采纳

-①4.1x+221.4=4.25x+216 ②43-2(5+3)=3+6(x-1) ③27=x2[19+(20-x...
4.1x+221.4=4.25x+216 0.15x=5.4 x=3.6 ②43-2(5+3)=3+6(x-1)27=6x-3 x=5

-①4.1x+221.4=4.25x+216
解:4.1X+221.4=4.25X+216 4.25X-4.1X=221.4-216 (4.25-4.1)X=5.4 0.15X=5.4 X=36

4.1X+221.4=4.25X+216怎么解
221.4-216=4.25x-4.1x 5.4=0.15x x=5.4÷0.15=36

4.1X+221.4=4.25X+216怎么解
4.1X+221.4=4.25X+216 4.25X-4.1X=221.4-216 0.15X=5.4 X=5.4÷0.15 X=36

4.1x+221.4=4.25x+216
4.1x+221.4=4.25x+216 0.15x=5.4 15x=540 x=36

四点1x加二二十一点四等于四点25x加216
4.1x+221.4=4.25x+216 4.25x-4.1x=221.4-216 0.15x=5.4 x=36

某人到商店买红蓝两种钢笔,红钢笔定价5元,蓝钢笔定价9元,由于购买量较 ...
0.15x=221.4-216,x=36;答:红笔买了36支.故答案为:36.如果非要李用算术解的话,就是红笔按85%打折后便宜的钱比按18%打折便宜又少便宜的钱=蓝笔按80%打折后便宜的钱比按18%打折便宜又多便宜的钱,即,先算出等号后面的(9*20%*30-9*30*18%),再除以红笔每只多便宜的(5*18%-...

216+4.25x=(5x+270)×(1-0.18)
216+4.25x=(5x+270)×(1-0.18),216+4.25x=(5x+270)×0.82,216+4.25x=4.1x+221.4,0.15x=5.4,x=36

30*9*0.8+5x*0.85=30*9*0.82+5x*0.82
30*9*0.8+5x*0.85=30*9*0.82+5x*0.82 216+4.25x=221.4+4.1x 4.25x-4.1x=221.4-216 0.15x=5.4 x=5.4\/0.15 x=36

某人到商店买红蓝两种笔,红笔定价5元,蓝笔定价9元。由于购买量较多,商 ...
解:设买了X只红笔,得:5×0.85×X+9×30×0.8=(9×30+5X)×0.82 4.25X+216=221.4+4.1X 0.15X=5.4 X=36

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