计算下面各题,能简便的要写出简便运算过程.
①0.75×2.8+0.75×7.2
②1.01×101﹣1.01
③40.4×2.5
④45.8﹣2.72÷0.8×12.5
⑤(2.83+7.17)÷(1﹣0.9)
4.5×0.4+0.4×5.5.
脱式计算.你是最棒的!
6.5×8+3.5×8﹣448.5+(5.6﹣4.8)×131.9﹣1.9×(1.9﹣1.9)×29+
×29+291×
÷
×
×101﹣
49.5×﹣(50﹣
)×0.6
×
+
÷
+
÷[
×(1﹣
)]
897×﹣37.5%+104×0.375[
+
×(
﹣0.375)]÷
+
+
+
+
﹣(
+
)
17.5×0.65+0.175×25+1.75.
计算:19.58×66+22×91.26= . 64×12.5×0.25×0.05= .