求未知数X.x:12=12:8 4.5x+3.5x=32+8 12x=35.
第1个回答 2015-01-13
(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)
=
,
3x=12×5,
3x÷3=60÷3,
x=20.
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.