80%×0.25-60%÷4 |
120%X-X=0.8 |
1.2×85+16×-120% |
:4=X: |
4.8×3.9+6.1×4 |
=. |
(1)80%×0.25-60%÷4,
=0.8×0.25-0.6×
,
=0.8×0.25-0.6×0.25,
=(0.8-0.6)×0.25,
=0.2×0.25,
=0.05;
(2)120%X-
X=0.8,
(120%-
)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×
-120%,
=1.2×85+16×1.2-1.2,
=1.2×(85+16-1),
=1.2×100,
=120;
(4)
:4=X:
,
4X=
×
,
4X=
,
4X÷4=
÷4,
X=
;
(5)4.8×3.9+6.1×4
,
=4.8×3.9+6.1×4.8,
=4.8×(3.9+6.1),
=4.8×10,
=48;
(6)
=
,
0.5X=1.8×2,
0.5X÷0.5=3.6÷0.5,
X=7.2.
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