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8.7 5x 0.57 解方程

5x-8.7=10.92 ,则5x=10.92+8.7,则5x=19.62,则x=3.9242.1*7+1.5x=23.7 ,则1.5x=23.7-14.7,则1.5x=9,则x=6

解:移项得10x=48.2-52.2化简得x=0.4

5x = 8.7+3.65x = 12.3 x = 2.46

7.8+5x=32.8 7.8+5x-7.8=32.8-7.8 5x=25 5x÷5=25÷5 x=5

5x-2/8=7/25x=3.5+0.255x=3.75x=0.75祝你学习进步,采纳哦,谢谢

(1)5x+28=71, 5x+28-28=71-28, 5x=43, 5x÷5=43÷5, x=8.6;(2)8.7-1.2x=3.9,8.7-1.2x+1.2x-3.9=3.9+1.2x-3.9, 4.8=1.2x, 1.2x=4.8, 1.2x÷1.2=4.8÷1.2, x=4;(3)8x-2.6x=37.8, 5.4x=37.8, 5.4x÷5.4=37.8÷5.4, x=7;(4)0.75x-0.95*4=8.5, 0.75x-3.8=8.5, 0.75x-3.8+

7.8-5X=2x-227.8+22=2X+5X 7X=29.8 X=298/70假如与圆锥等地等高的是圆柱 那么圆柱体积是圆锥体积的3倍因为长方体的地面积与高都与圆锥相等所以也和刚刚假设的那个圆柱相等 所以长方形的体积=SH 圆柱也是SH 所以长方体体积是圆锥的3倍 比是3:1

8.7+x=26.8 x=26.8-8.7 x=14.1

5x一12十8=3x十122x=24-8=16∴x=8

5x-0.7x3=6.65x=6.6+2.15x=8.7x=1.74谢谢采纳!

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