求下面各角的度数．已知∠1=30°，∠2=90°．∠3= ；∠4= ；∠5= ．
脱式计算与简便运算= = = = 6﹣×﹣= 〔1﹣（﹣）〕÷= = = 5+3.6×2.5÷0.48= = = = 3.6×2÷16.9÷（3×1.1 6）×1.3= +++…+= ．
=（）×12=
546﹣398457+199 2.2×1015.4×99+5.432×0.125×25 ．
计算：的值为多少？
脱式计算，能简便的简便． 4.2﹣1.38+5.8﹣3.620.125×0.25×32 2
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的值为多少？
