问题
解答题
求未知数X. x:12=12:84.5x+3.5x=32+8
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答案
(1)x:12=12:8,
8x=12×12,
8x÷8=144÷8,
x=18;
(2)4.5x+3.5x=32+8,
8x=40,
8x÷8=40÷8,
x=5;
(3)
=12 x
,3 5
3x=12×5,
3x÷3=60÷3,
x=20.
求未知数X. x:12=12:84.5x+3.5x=32+8
|
(1)x:12=12:8,
8x=12×12,
8x÷8=144÷8,
x=18;
(2)4.5x+3.5x=32+8,
8x=40,
8x÷8=40÷8,
x=5;
(3)
=12 x
,3 5
3x=12×5,
3x÷3=60÷3,
x=20.