求未知数x. 3.2×2.5-75%x=212÷(0.5x+1)=4(x-1):37
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求未知数x.
3.2×2.5-75%x=2 | 12÷(0.5x+1)=4 | |
(x-1):
(1)3.2×2.5-75%x=2
8-0.75x=2 8-0.75x+0.75x=2+0.75x 8-2=2+0.75x-2 6÷0.75=0.75x÷0.75 x=8 (2)12÷(0.5x+1)=4 12÷(0.5x+1)×(0.5x+1)=4×(0.5x+1) 12÷4=4×(0.5x+1)÷4 0.5x+1-1=3-1 0.5x÷0.5=2÷0.5 x=4 (3)(x-1): 3 7=0.1: 3 7 x-1=0.1 x-1+1=0.1+1 x=1.1 (4)4x-24=2x+20 4x-24-2x+24=2x+20-2x+24 2x=44 2x÷2=44÷2 x=22
求未知数x. 3.2×2.5-75%x=212÷(0.5x+1)=4(x-1):37
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