题目内容
【题目】直接写出得数.
20+30= 12×3= 3.5﹣0.2= 33÷1.1 99×6=
0.65+2.35= 0.1×0.03= 651﹣105= 2﹣= +=
1÷= ×26= ÷= ﹣= 12÷×0=
2+= ×= ++= ××5= (0.27+0.9)÷0.9=
【答案】50,36,3.2,30,594,3,0.003,546,1,,4,12,2,,0,2,,1,,1.3
【解析】
试题分析:(1)(2)(3)(4)(5)(6)(7)(8)依据整数和小数四则运算计算方法解答;
(9)(10)(14)(16)依据分数加、减法计算方法先通分再解答;
(11)(12)(13)(17)(19)根据分数乘、除法的计算法则,进行计算,计算过程中能约分的要先约分再计算;
(15)根据0乘以或除以非0的数都得0进行计算;
(18)根据加法交换律和结合律进行计算;
(20)根据乘法分配律进行计算.
解:(1)20+30=50;
(2)12×3=36;
(3)3.5﹣0.2=3.2;
(4)33÷1.1=30;
(5)99×6=594;
(6)0.65+2.35=3;
(7)0.1×0.03=0.003;
(8)651﹣105=546;
(9)2﹣=1;
(10)+=;
(11)1÷=4;
(12)×26=12;
(13)÷=2;
(14)﹣=;
(15)12÷×0=0;
(16)2+=2;
(17)×=;
(18)++=1;
(19)××5=;
(20)(0.27+0.9)÷0.9=1.3.
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