(2010•双阳区) 解方程或比例.
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(2010•双阳区)
解方程或比例. 1+0.6x=9.5 | x-0.25=
(1)1+0.6x=9.5,
1+0.6x-1=9.5-1, 0.6x÷0.6=8.5÷0.6, x=14 1 6; (2)x-0.25= 1 2, x-0.25+0.25= 1 2+0.25, x=0.75; (3) 3 4x+ 1 6x=66, 11 12x=66, 11 12x× 12 11=66× 12 11, x=72; (4) 36 x= 54 3, 54x=36×3, 54x÷54=108÷54, x=2; (5)1.25:0.25=x:2.4, 0.25x=1.25×2.4, 0.25x÷0.25=3÷0.25, x=12; (6) 3 4: 5 6= 1 4:x 3 4x= 5 6× 1 4, 3 4x× 4 3= 5 24× 4 3, x= 5 18. |