1﹣20%x=1.6; 4:x=2:1.2; 5x﹣ x= .
0.19+0.1= 20×70%= 1﹣= 2.7×4×2.5=
7.53﹣0.03= += +×0= 0.99÷0.1=
1×0.99=
0.64÷8=
2023×0.125×8=
0.9+99×0.9=
100÷50%=
=
x÷(1﹣ ﹣25%)=2 .
①1.5x-2.8=4.7
②
③12: =
x+ =6
:36%= x
9.5﹣3x=4.5.
1 :4=x:2.5; 4.9+50%x=6.3; 6.9﹣ x= .