问题 解答题
80%×0.25-60%÷4120%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
答案

(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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