问题
解答题
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答案
(1)9x+17.2=57.7,
9x+17.2-17.2=57.7-17.2,
9x=40.5,
9x÷9=40.5÷9,
x=4.5;
(2)6.7x+2.2x=93.45,
8.9x=93.45,
8.9x÷8.9=93.45÷8.9,
x=10.5;
(3)X÷6.5=7.6
X÷6.5×6.5=7.6×6.5,
X=49.4;
(4)18(x+0.9)=22.5,
18(x+0.9)÷18=22.5÷18,
x+0.9=1.25,
x+0.9-0.9=1.25-0.9,
x=0.35;
(5)4×2.3+2x=9.8,
9.2+2x=9.8,
9.2+2x-9.2=9.8-9.2,
2x=0.6,
2x÷2=0.6÷2,
x=0.3;
(6)2(3x-3)÷2=9÷2,
3x-3=4.5,
3x-3+3=4.5+3,
3x=7.5,
3x÷3=7.5÷3,
x=2.5.