求未知数X:
1.6×X=3.28
X÷0.18=8.45
1.26÷X=28.
(1)1.6×X=3.28,
1.6×X÷1.6=3.28÷1.6,
x=2.05;
(2)X÷0.18=8.45,
X÷0.18×0.18=8.45×0.18,
x=1.521;
(3)1.26÷X=28,
1.26÷X×X=28X,
28X÷28=1.26÷28,
X=0.045.
求未知数X:
1.6×X=3.28
X÷0.18=8.45
1.26÷X=28.
(1)1.6×X=3.28,
1.6×X÷1.6=3.28÷1.6,
x=2.05;
(2)X÷0.18=8.45,
X÷0.18×0.18=8.45×0.18,
x=1.521;
(3)1.26÷X=28,
1.26÷X×X=28X,
28X÷28=1.26÷28,
X=0.045.