问题
解答题
求未知数X
|
答案
(1)
=4.9 6.3
,x 9
6.3x=4.9×9,
6.3x÷6.3=44.1÷6.3,
x=7;
(2)7.5x-3.8x=74,
3.7x=74,
3.7x÷3.7=74÷3.7,
x=20;
(3)12×3+8x=108,
36+8x=108,
36+8x-36=108-36,
8x=72,
8x÷8=72÷8,
x=9.
求未知数X
|
(1)
=4.9 6.3
,x 9
6.3x=4.9×9,
6.3x÷6.3=44.1÷6.3,
x=7;
(2)7.5x-3.8x=74,
3.7x=74,
3.7x÷3.7=74÷3.7,
x=20;
(3)12×3+8x=108,
36+8x=108,
36+8x-36=108-36,
8x=72,
8x÷8=72÷8,
x=9.