求未知数x.和托是计算能简算的简算.马上要交了.求求求求求求求积极急0.6x＋9=2722.3x-11x=45.21/2比4=x比4/53/5=x/4.2脱式能简算的简算7/10÷9＋3/10×1/98.2－6.25＋9.8-0.751/5÷6/25-2/3×7/324.86×1÷(2.1

Question

求未知数x.和托是计算能简算的简算.马上要交了.求求求求求求求积极急
0.6x＋9=27 22.3x-11x=45.2 1/2比4=x比4/5 3/5=x/4.2 脱式能简算的简算 7/10÷9＋3/10×1/9 8.2－6.25＋9.8-0.75 1/5÷6/25-2/3×7/32 4.86×【1÷(2.1-2.09）】

Answer 1

0.6x＋9=27
0.6x=27-9;
0.6x=18;
x=30;
22.3x-11x=45.2
11.3x=45.2;
x=4;
1/2比4=x比4/5
4x=(1/2)×(4/5);
4x=2/5;
x=1/10;
3/5=x/4.2
5x=12.6;
x=2.52;
脱式能简算的简算
7/10÷9＋3/10×1/9
=（1/9）×(7/10+3/10)
=1/9;
8.2－6.25＋9.8-0.75
=(8.2+9.8)-(6.25+0.75)
=18-7
=11;
1/5÷6/25-2/3×7/32
=1/5×25/6-2/3×7/32
=5/6-7/48
=40/47-7/48
=33/48;
=11/16;
4.86×【1÷(2.1-2.09）】
=4.86×(1÷0.01)
=4.86×100
=486;
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