题目内容

80%×0.25-60%÷4 120%X-
4
5
X=0.8
1.2×85+16×
6
5
-120%
2
3
:4=X:
1
2
4.8×3.9+6.1×4
4
5
1.8
X
=
0.5
2
(1)80%×0.25-60%÷4,
=0.8×0.25-0.6×
1
4

=0.8×0.25-0.6×0.25,
=(0.8-0.6)×0.25,
=0.2×0.25,
=0.05;

(2)120%X-
4
5
X=0.8,
  (120%-
4
5
)X=0.8,
  (1.2-0.8)X=0.8,
          0.4X=0.8,
     0.4X÷0.4=0.8÷0.4,
             X=2;

(3)1.2×85+16×
6
5
-120%,
=1.2×85+16×1.2-1.2,
=1.2×(85+16-1),
=1.2×100,
=120;

(4)
2
3
:4=X:
1
2

        4X=
2
3
×
1
2

        4X=
1
3

     4X÷4=
1
3
÷4,
         X=
1
12


(5)4.8×3.9+6.1×4
4
5

=4.8×3.9+6.1×4.8,
=4.8×(3.9+6.1),
=4.8×10,
=48;

(6)
1.8
X
=
0.5
2

     0.5X=1.8×2,
0.5X÷0.5=3.6÷0.5,
        X=7.2.
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