求未知数x的值。(带*的要验算)
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(1)3 x+2.4x=![]() 6.2x= ![]() x= ![]() 验算:3 × +2.4× =![]() | (2)0.8x-28.7=11.3 |
(3) | (4)6(0.6+x)= 4![]() 3.6+6x= 4.5 6x=0.9 x=0.15 |
| (5)36:72=14:x 36x=14×72 x=28 | (6)5.6:x=3.6:1.8 3.6x=1.8×5.6 x=2.8 |
(7)x:20%=2:![]() x= 40%x= ![]() | (8)2.4:1.6=3.6:x 2.4x=3.6×1.6 x=2.4 |
(9) =![]() 2.4x=7.5×25 x= ![]() | (10)1.4:1 =1:x1.4x=1 ![]() x= ![]() |
x+2.4x=
*
(x-5)=75%

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