①0.25×1.56×4
②0.74×99+0.74
③7.5÷1.5×1.3
④2.74÷0.125÷8
⑤12.5×7.2
⑥27.3÷[(7.4-6.8)×1.3]
20×0.05= 1.8÷6= 0.62÷2= 0.05÷0.5=
2.5×8= 1.95+3.25= 4.8÷12= 21÷0.7=
1.2×7= 13.2×0.2= 0.001÷0.1= 18.7×0×4=
8÷5= 2.4×5= 420×0.05= 0÷2.5×4=
10-8.7=
5.6÷1.4=
2.07÷0.01=
2.9÷2.9×9.2=
0.12=
0.63÷7=
100-0.19=
2.81-1.7-0.3=
0.58×6.69+6.69×0.42
(0.8-0.7+0.3)×6.69
6.69÷(0.59+0.1×0.1)
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。