问题
解答题
求未知数X.
X-0.25=1.7520%x-1.8×4=0.8114:X=0.4:8.
答案
(1)X-0.25=1.75,
X-0.25+0.25=1.75+0.25,
X=2;
(2)20%x-1.8×4=0.8,
0.2x-7.2=0.8,
0.2x-7.2+7.2=0.8+7.2,
0.2x=8,
0.2x÷0.2=8÷0.2,
x=40;
(3)114:X=0.4:8,
0.4X=114×8,
0.4X÷0.4=912÷0.4,
X=2280.