求未知数X.x:12=12:84.5x+3.5x=32+8
求未知数X.x:12=12:84.5x+3.5x=32+812x=35....
求未知数X.x:12=12:84.5x+3.5x=32+8 12 x = 3 5 .
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轩狗TA57
2014-10-11
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(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. |
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