Question

9x-28.35+2x=71.2怎么解方程？

Answer 1

9x-28.35+2x=71.2
解：11x-28.35=71.2
11x=71.2+28.35
11x=99.55
x=99.55÷11
x=9.05

Answer 2

解：解方程，此方程的解为x = 181/20，【即x = 9.05】
9x - 28.35 + 2x = 71.2

9x + 2x = 71.2 + 28.35
11x = （71×10+ 2）/10 + （28×100+35）/100
11x = 712/10 + 2835/100
11x = 7120/100 + 2835/100
11x = 9955/100
11x = 1991/20
x = 1991/20 ÷ 11
x = 1991/20 × 1/11
x = 181/20
∴x = 9.05
答：此方程的解为x = 181/20，【即x = 9.05】

Answer 3

方程左边合并同类项得到，（9+2）x-28.35=71.2，移项就有11x=71.2+28.35，解得x=99.55/11=9.05。

Answer 4

 五年级解方程公式大全，五年级解方程公式大全3X+5X=48 14X-8X=12 6*5+2X=44 20X-50=50 28+6X=88 32-22X=10 24-3X=3 10X*（5+1）=60 99X=100-X X+3=18 X-6=12 56-2X=20 4y+2=6 x+32=76 3x+6=18 16+8x=40 2x-8=8 4x-3*9=29