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4.9÷(5x)=0.8怎么解方程

5x-0.8x=0.84 4.2x=0.84 x=0.2

(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

(1)5x-0.8×10=3.19 5x-8=3.19 5x-8+8=3.19+8 5x÷5=11.19÷5 x=2.238(2)12x+7×30%=14.7 12x+2.1=14.7 12x+2.1-2.1=14.7-2.1 12x=12.6 12x÷12=12.6÷12 x=1.05(3)2x÷5=15 2x÷5×5=15×5 2x=75 2x÷2=75÷2 x=37.5(4)2x+25=35 2x+25-25=35-25 2x=...

5x-4=16 5x=20 x=4

8+5x=208 5x=208-8 x=200➗5 x =40

题干不详

(1)X÷0.8=1.25, X÷0.8×0.8=1.25×0.8,X=1;(2)3X-1.2X=9, (3-1.2)X=9, 1.8X=9, 1.8X÷1.8=9÷1.8, X=5;(3)5(X-6)=12, 5X-30=12, 5X-30+30=12+30, 5X=42, 5X÷5=42÷5, X=8.4;(4)7X-2×9=80, 7X-18=80, 7X-18+18=80+18, 7...

解:40÷5x=20 40=20X5x 40=100x 100x=40 x=0.4

5x÷0.8=3.2 解:5x=3.2×0.8 5x=2.56 x=2.56÷5 x=0.512

(8+5x)÷4=30 (8+5x)=30X4 8+5x=120 5x=120-8 5x=112 x=22.4

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