北师大版四年级数学下册计算训练(共2页).doc

精选优质文档-倾情为你奉上小数乘法小数加、减法结合律：(a+b)+c=a+(b+c)(ab) c=a(bc)乘法分配律a（b+c）=ab+acab+ac =a（b+c）脱式计算（按照运算顺序）1.140.7= 4.528= 7.420= 6.21.4=5.42.6=26.8+3.02= 6.07-4.993= 3.7+2.36= 15.4+2.97= 10.2-8.75=2.51.94421.250.086.94.83.1 0.66.22+3.78250.230.4（40+0.8）2.512.5（0.8+80）30（1.5+0.1）3.2523-3.2513 0.281880.2812.83(8.453.69) 100(8.75.24) 84.066.475.19 5.43+(15.27+30.29