用竖式计算.3.49+2.15 7.4﹣3.68 5.3×0.26 3.9÷0.65.
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= .
2.89×4.68+4.68×6.11+4.68.
1+12.7+5.9+17.3270﹣42.5﹣17.5125×88130÷25÷4 25×32×125125×103﹣125×322.4×25﹣25×2.4.