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4.9÷(5x)=0.8怎么解方程

4.9÷(5x)=0.8 4.9=0.8*5x 4.9=4x x=4.9/4=1.225

4.9÷7/2-5x=0.8 解:1.4-5x=0.8 5x=1.4-0.8 5x=0.6 x=0.12

100*8/5=160

(1) 5x一8=20 5x=20+8 5x=28 x=5.6 (2) ×÷60+0.4=4.9 x÷60=4.9-0.4 x÷60=4.5 x=60×4.5 x=270 (3) 5x=75 x=75÷5 x=15 (4) 4x+20.4=100.4 4x=100.4-20.4 4x=80 x=20

96.2-12.5x2.4 =96.2-12.5x0.4x6 =96.2-30 =66.2 得到的结果为66.2

15X-2.5=11.5 15X=11.5+2.5 15X=14 X=14/15; 3(x+2)=39 X+2=39/3 X+2=13 X=13-2 X=11 x-(3/5)x=6/5 (5/5-3/5) x=6/5 (2/5)x=6/5 2x=6 x=6/2 x=3 4.9÷7/2-5x=0.8 0.7/2=5x+0.8 5x=0.7/2-0.8 5x=0.35-0.8 x=-0.45/5=-0.09 8/5÷x=16 8/5=16x x=(8/5...

解: 60÷5x=20 5x=60÷20 5x=3 x=3/5

4.9÷12.5 =(4.9x8)÷(12.5x8) =39.2÷100 =0.392

100-5x=93 x+12.8=30 55-x=32.76 x÷70=4.9 5.6x=78.4 18x+21=48 8x-4x=56 3.6x+2.2x=63.8 2x+24=108 2x+8=16 6X+2=38

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