0.2+0.38= 0.8×7×12.5= 0.42= 0.28÷2.8= a- 0.9a=
3000×0.09= 1.95-0.5 = 0.9-0.09 = 0.2÷0.001= 8.4÷4=
微信扫码预览、分享更方便