计算下面各题(能简算的要简算).2.16÷(2.84+7.96)×0.837×9.9945.7×3.9+5.43×39[20.08+(32﹣29.9÷23)]÷2.
8-x=3-x=
2x+3x=3.153.4x=8.6-1.8
2(200-15x)=70+25x3(2x+1)=12
0.92×1.41+0.92×8.59×-× 1.3×11.6-1.6×1.3×11.6+18.4×
13×÷29÷× 15.68+(5.39+4.32) 19.68-(2.97+9.68) 7+(-) 5-(-)