6.8+12÷x=10.8,14-0.5(x+3)=7.8,3.5x-3x-10=8,7.9-5x=7.8÷2
2个回答
2012-11-26
展开全部
6.8+12÷x=10.8, 12÷x=4, x=12÷4, x=3;
14-0.5(x+3)=7.8, 0.5(x+3)=6.2, x+3=12.4, x=9.4
3.5x-3x-10=8, 0.5x=18, x=36
7.9-5x=7.8÷2; 5x=4, x=0.8
10x-20=6x, 4x=20, x=5;
10+6x=8x, 2x=10, x=5;
2(x+54)=8x, 2x+108=8x, 6x=108, x=18;
25-2x=5+2x, 4x=20, x=5
14-0.5(x+3)=7.8, 0.5(x+3)=6.2, x+3=12.4, x=9.4
3.5x-3x-10=8, 0.5x=18, x=36
7.9-5x=7.8÷2; 5x=4, x=0.8
10x-20=6x, 4x=20, x=5;
10+6x=8x, 2x=10, x=5;
2(x+54)=8x, 2x+108=8x, 6x=108, x=18;
25-2x=5+2x, 4x=20, x=5
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