问题
解答题
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答案
(1)19-120%X=7
19-120%x+120%x=7+120%x
7+120%x-7=19-7
120%x÷120%=12÷120%
x=10;
(2)
÷25%=12x 2
÷25%×25%=12×25%x 2
×2=3×2x 2
x=6;
(3)
-10%x=7.5x 4
0.15x=7.5
0.15x÷0.15=7.5÷0.15
x=50.
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(1)19-120%X=7
19-120%x+120%x=7+120%x
7+120%x-7=19-7
120%x÷120%=12÷120%
x=10;
(2)
÷25%=12x 2
÷25%×25%=12×25%x 2
×2=3×2x 2
x=6;
(3)
-10%x=7.5x 4
0.15x=7.5
0.15x÷0.15=7.5÷0.15
x=50.