问题
解答题
解比例
|
答案
(1)49:(5+x)=14:2
49×2=5×14+14x
98-70=70+14x-70
28÷14=14x÷14
x=2;
(2)0.8:x=
:0.753 5
x=0.8×0.753 5
x÷3 5
=0.6÷3 5 3 5
x=1;
(3)
=45 8 2+x 0.8
45×0.8=8×2+8x
36-16=16+8x-16
20÷8=8x÷8
x=2.5;
(4)
=3.2 7 x+8 5
3.2×5=7x+7×8
16-56=7x+56-56
-40÷7=7x÷7
x=-5
;5 7
(5)x:3.6=3.2 1.8
1.8x=3.6×3.2
1.8x÷1.8=11.52÷1.8
x=6.4;
(6)
:2 5
=x:5 7 3 14
x=5 7
×2 5 3 14
x÷5 7
=5 7
÷3 35 5 7
x=
.3 25