2011-2012学年度第一学期怀德小学五年级数学计算能力竞赛试题学校_ 班级_ 姓名_ 得分_一、直接写出结果。 (16分)0.76+2.4= 3-0.83= 1.60.08=0.424.2=2.43= 9.30.93=1.3-0.03= 5.7+3.2=8.48.4= 7.20.72= 0.782.5= 0.5418=14 - 4.7=2.50.4=0.32= 4.22.14.22.1=二、竖式计算。(除不尽的保留两位小数)(18分,每题3分)5.751.2= 7.383.6= 6.43.45=2.0875= 18.90.54= 1.30.03三、怎样简便就简便算。(50分,每题5分)25.4-2.74-3.26 4.33.85.73.86.93.10.2 0.27990.274.2-2.10.7+5.08 2.07+2.3+6.93+7.72.53212.5 4.5102(5.84-3.9)0.4 3.680.254四、解方程。(16分,每题4分)X4.8 = 7.48 X0.36X = 12.83X + 44.5 =20.1 3(X+2.1)=10.5附加题(用简便方法计算)。(20分)999+99.9+9.99+0.999 4978.497849.78497.8