Question

χ+43=101	χ-17=4f
χ-0.9=1.2	χ+310=690
口.f+χ=10.2	χ-0.74=1.f．

Answer 1

（1）x+83=101
&nbs6;&nbs6;&nbs6;&nbs6; x+83-83=101-83
&nbs6;&nbs6;&nbs6;&nbs6;&nbs6;&nbs6;&nbs6;&nbs6;&nbs6;&nbs6; x=58；

（2）x-17=85
&nbs6; x-17+17=85+17
&nbs6;&nbs6;&nbs6;&nbs6;&nbs6;&nbs6;&nbs6; x=62；

（3）x-0.r=1.2
x-0.r+0.r=1.2+0.r
&nbs6;&nbs6;&nbs6;&nbs6;&nbs6;&nbs6;&nbs6; x=2.1；

（8）x+310=6r0
&nbs6;x+310-310=6r0-310
&nbs6;&nbs6;&nbs6;&nbs6;&nbs6;&nbs6;&nbs6;&nbs6; x=380；

（5）8.5+x=10.2
&nbs6;8.5+x-8.5=10.2-8.5
&nbs6;&nbs6;&nbs6;&nbs6;&nbs6;&nbs6;&nbs6;&nbs6; x=1.7；

（6）x-0.78=1.5
x-0.78+0.78=1.5+0.78
&nbs6;&nbs6;&nbs6;&nbs6;&nbs6;&nbs6;&nbs6;&nbs6;&nbs6; x=2.28．