(1—25%)X=12(解方程,) 6X—4.8=5.28 X—80%X=42

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(1—25%)X=12(解方程,) 6X—4.8=5.28 X—80%X=42
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(1—25%)X=12(解方程,) 6X—4.8=5.28 X—80%X=42
(1—25%)X=12(解方程,) 6X—4.8=5.28 X—80%X=42

(1—25%)X=12(解方程,) 6X—4.8=5.28 X—80%X=42
(1—25%)X=12
0.75X=12
X=12÷0.75
X=16
6X—4.8=5.28
6X=5.28+4.8
6X=10.8
X=10.8÷6
X=1.8
X—80%X=42
0.2X=42
X=42÷0.2
X=210

(1—25%)X=12
0.75X=12
X=12÷0.75
X=16
6X—4.8=5.28
6X=5.28+4.8
X=10.08÷6
X=1.68
X—80%X=42
(1-80%)X=42
0.2X=42
X=42÷0.2
X=210