①7.2x-5.4x=12.6 ②3x+5×1.2=15 ③x÷0.05=5 ④X-0.8x-6=16 ⑤0.72×3-7x=0.06 ⑥(1.6+3.4)x=
①7.2x-5.4x=12.6②3x+5×1.2=15③x÷0.05=5④X-0.8x-6=16⑤0.72×3-7x=0.06⑥(1.6+3.4)x=14⑦75÷(x+1...
①7.2x-5.4x=12.6 ②3x+5×1.2=15 ③x÷0.05=5 ④X-0.8x-6=16 ⑤0.72×3-7x=0.06 ⑥(1.6+3.4)x=14 ⑦75÷(x+10)=2 ⑧x÷0.05=55 ⑨5x-3×(28-x)=12+2x.
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①7.2x-5.4x=12.6,
(7.2-5.4)x=12.6,
1.8x=12.6,
1.8x÷1.8=12.6÷1.8,
x=7;
②3x+5×1.2=15,
3x+6=15,
3x+6-6=15-6,
3x=9,
3x÷3=9÷3,
x=3;
③x÷0.05=5,
x÷0.05×0.05=5×0.05,
x=0.25;
④x-0.8x-6=16,
0.2x-6=16,
0.2x-6+6=16+6,
0.2x=22,
0.2x÷0.2=22÷0.2,
x=110;
⑤0.72×3-7x=0.06,
2.16-7x=0.06,
2.16-7x+7x=0.06+7x,
0.06+7x=2.16,
0.06+7x-0.06=2.16-0.06,
7x=2.1,
7x÷7=2.1÷7,
x=0.3;
⑥(1.6+3.4)x=14,
5x=14,
5x÷5=14÷5,
x=2.8;
⑦75÷(x+10)=2,
75÷(x+10)×(x+10)=2×(x+10),
2x+20=75,
2x+20-20=75-20,
2x=55,
2x÷2=55÷2,
x=27.5;
⑧x÷0.05=55,
x÷0.05×0.05=55×0.05,
x=2.75;
⑨5x-3×(28-x)=12+2x,
8x-84=12+2x,
8x-84+84=12+2x+84,
8x=96+2x,
8x-2x=96+2x-2x,
6x=96,
6x÷6=96÷6,
x=16.
(7.2-5.4)x=12.6,
1.8x=12.6,
1.8x÷1.8=12.6÷1.8,
x=7;
②3x+5×1.2=15,
3x+6=15,
3x+6-6=15-6,
3x=9,
3x÷3=9÷3,
x=3;
③x÷0.05=5,
x÷0.05×0.05=5×0.05,
x=0.25;
④x-0.8x-6=16,
0.2x-6=16,
0.2x-6+6=16+6,
0.2x=22,
0.2x÷0.2=22÷0.2,
x=110;
⑤0.72×3-7x=0.06,
2.16-7x=0.06,
2.16-7x+7x=0.06+7x,
0.06+7x=2.16,
0.06+7x-0.06=2.16-0.06,
7x=2.1,
7x÷7=2.1÷7,
x=0.3;
⑥(1.6+3.4)x=14,
5x=14,
5x÷5=14÷5,
x=2.8;
⑦75÷(x+10)=2,
75÷(x+10)×(x+10)=2×(x+10),
2x+20=75,
2x+20-20=75-20,
2x=55,
2x÷2=55÷2,
x=27.5;
⑧x÷0.05=55,
x÷0.05×0.05=55×0.05,
x=2.75;
⑨5x-3×(28-x)=12+2x,
8x-84=12+2x,
8x-84+84=12+2x+84,
8x=96+2x,
8x-2x=96+2x-2x,
6x=96,
6x÷6=96÷6,
x=16.
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