用简便方法计算下面各题99÷4.5 12÷1.5÷2 1.28×6﹣1.28﹣1.28×545×101 4÷2.5 12.5×1.3×0.8.
= ()×12=
546﹣398 457+199 2.2×101 5.4×99+5.4 32×0.125×25 .
计算:的值为多少?
脱式计算,能简便的简便.4.2﹣1.38+5.8﹣3.62 0.125×0.25×322
4+3.2+5+6.8=25×(8×0.4)×1.25=7﹣(2﹣)=(++)×72=93.5÷3÷16÷2.5=.