80%X+12=40 X-20%X=16 X+30%X=65 1- 1 3 X= 5 6 (1-60%)X=0.32 125%.
80%X+12=40X-20%X=16X+30%X=651-13X=56(1-60%)X=0.32125%X-X=44....
80%X+12=40 X-20%X=16 X+30%X=65 1- 1 3 X= 5 6 (1-60%)X=0.32 125%X-X=44.
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(1)80%x+12=40, 80%x+12-12=40-12, 80%x÷80%=28÷80%, x=35; (2)x-20%x=16, 80%x=16, 80%x÷80%x=16÷80%, x=20; (3)x+30%x=65, 130%x=65, 130%x÷130%=65÷130%, x=50; (4)1-
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(5)(1-60%)x=0.32, 40%x=0.32, 40%x÷40%=0.32÷40%, x=0.08; (6)125%x-x=44, 0.25x=44, 0.25x÷0.25=44÷0.25, x=176. |
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