4+0.7x=102
÷ =
﹣ =
× =
+ × ×0=
43.96+31.4=
0.625×8=
2.8× =
0.25×16=
47+53= 420÷70= 100﹣28.5= 0.03×8= 234﹣199=
50×80= 2.7÷0.9= += 1÷= ×=
①15.28﹣3.6﹣3.4
②()×7.2
③
④7.5÷[(6.8﹣4.3)×0.12]
①40×[2-(+)]
②48×(+-)
③(2.74+5.4÷2.7)×0.3
④0.25×1.25×32
⑤507÷3+12.5×11
⑥2011×
6.5%读作,一百二十一点五亿写作,8.5%改写成小数是,1320000000四舍五入到“亿”位是亿。
3764,1900,809,9973,5720,495,4890