3x﹣4×6.5=7.6 12.5x+x=108 *x-9.42=12.56
100-x=58.9 3(x-2.1)=8.4 *9.6÷x=3
0.5×1.6×12.5 23.5×4.6+2.35×54 18.9-7.5÷(0.44+1.06)