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(X+3)×4÷2=10 解方程,,,,要有过程

(X十3)X4二10X2

解:30x+8x=20-10÷3+4+15÷2 合并同类项得: 38x=24-10÷3+15÷2 x=(24-10÷3+15÷2)÷38 =(24-3.33+7.5)÷38 =28.17÷38 =0.74

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(x+30)÷2=80 x+30=80×2 x+30=160 x=160-30 x=130

6x÷2+(x+4)×4÷2=(6+4)×4÷2 6x+(x+4)*4=40 6x+4x+16=40 10x=40-16 10x=24 x=2.4 (3-10/7﹚÷1/2×2/5 =(3-10/7)*2*2/5 =(3-10/1*4/5 =3*4/5-10/7*4/5 =12/5-8/7 =84/35-40/35 =44/35 =1又35分之9

60%x-3/8=11.625 60%x-0.375=11.625 60%x=12 x=20 (x+2.8)×2=10.4 x+2.8=5.2 x=2.4 8x÷(1.8+3)=1 8x÷4.8=1 8x=4.8 x=0.6

(1)x+3.2=10.83, x+3.2-3.2=10.83-3.2, x=7.63;(2)x÷13=20, x÷13×13=20×13, x=260;(3)9x-36-5x=5x-5x, 4x-36=0, 4x-36+36=0+36, 4x=36, 4x÷4=36÷4, x=9;(4)2.5×3-2x=0.5, 7.5-2x=0.5, 7.5-2x+2x=0.5+2x, 0.5+2x=7.5, 0....

16.4÷x=4 x=16.4÷4 x=4.1

原式化简为: 2(4X/7+2)=3(3X/7-2 ) 8X/7+4=9X/7-6 ∴X/7=10 ∴X=70

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