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解方程:x^2%x%4=1/x%1/x^2

⑴1.2-1.6X=4.2, 1.6X=1.2-4.2, X=-15/8, ⑵2.4X+0.5X=7.2, 2.9X=7.2, X=72/29。

(1)x+35x=64 85x=64 85x÷85=64÷85 x=40;(2)20%x-0.4=1.2 20%x-0.4+0.4=1.2+0.4 20%x=1.6 20%x÷20%=1.6÷20% x=8.

(1)20%X=10, 20%X÷20%=10÷20% x=50;(2)95%X-65%X=9, 30%x=9, 30%x÷30%=9÷30%, x=30;(3)50%X-30%X=5.5, 20%x=5.5, 20%x÷20%=5.5÷20%, x=27.5;(4)X+350%X=90, 450%x=90, 450%x÷450%=9÷450%, x=2;(5)12X+4X=128, 16x=128...

(1) 1 3 (X+1.5)=12.5, 1 3 (X+1.5)÷ 1 3 =12.5÷ 1 3 , X+1.5=37.5, X+1.5-1.5=37.5-1.5, X=36;(2)x-28%x=21.6, 0.72x=21.6,0.72x÷0.72=21.6÷0.72, x=30;(3) 3 4 X- 5 8 X= 3 4 , 1 8 X= 3 4 , 1 8 X÷ 1 8 = 3 4 ÷ 1 8 ,...

(1)15%x+x=75. 9 1.15x=75.9 x=66 (2)43%x -18 %x=20 25%x=20 x= 80 (3)(x+350) ×70%= 420 x+350=600 x=250 (4)x+30%x-43=122× 1.3x=104 x= 80 (5) x ×x= × x= (6) =4:1.5 4x=3.6×1.5 x=1.35

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