解方程x-60%x=160 120x-20x=40 &nbs...
解方程x-60%x=160120x-20x=40x+130%x=46050%x-33%x=3430%x=120x+x5=24025%x=7560%x-35%x=125x-...
解方程x-60%x=160 120x-20x=40 x+130%x=460 50%x-33%x=34 30%x=120 x+x5=240 25%x=75 60%x-35%x=125 x-40%x=120 x+15%x=115 15x-30=150 8x+42=178.
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(1)x-60%x=160,
0.4x=160,
0.4x÷0.4=160÷0.4,
x=400;
(2)120x-20x=40,
100x=40,
100x÷100=40÷100,
x=0.4;
(3)x+130%x=460,
2.3x=460,
2.3x÷2.3=460÷2.3,
x=200;
(4)50%x-33%x=34,
0.17x=34,
0.17x÷0.17=34÷0.17,
x=200;
(5)30%x=120,
30%x÷30%=120÷30%,
x=400;
(6)x+
x |
5 |
1.2x=240,
1.2x÷1.2=240÷1.2,
x=200;
(7)25%x=75,
25%x÷25%=75÷25%,
x=300;
(8)60%x-35%x=125,
0.25x=125,
0.25x÷0.25=125÷0.25,
x=500;
(9)x-40%x=120,
0.6x=120,
0.6x÷0.6=120÷0.6,
x=200;
(10)x+15%x=115,
1.15x=115,
1.15x÷1.15=115÷1.15,
x=100;
(11)15x-30=150,
15x-30+30=150+30,
15x=180,
15x÷15=180÷15,
x=12;
(12)8x+42=178,
8x+42-42=178-42,
8x=136,
8x÷8=136÷8,
x=17.
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