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看谁算得又准又快.
27+68=
910-540= 18×40= 910÷70=
78-0.98= 3÷8= 10÷0.1= 0.8×12.5=
8.1÷0.03= 1.5×0.5= 10÷0.5= 0.5÷10=
410-210=
2
15
+
3
15
=
1
3
72.8÷0.8= 0.77+0.33=
1
3
+
1
4
)×12=
3
5
÷0.6=
1.25×
4
5
×8=.
分析:根据整数、小数、分数加减乘除四则运算的计算方法,进行求解.
1
3
+
1
4
)×12运用乘法分配律简算;
解答:解:
27+68=95                 910-540=370                      18×40=720                      910÷70=13
78-0.98=77.02            3÷8=0.375                       10÷0.1=100                     0.8×12.5=10
8.1÷0.03=270            1.5×0.5=0.75                    10÷0.5=20                      0.5÷10=0.05
410-210=200              
2
15
+
3
15
=
1
3
                        72.8÷0.8=91                    0.77+0.33=1.1
1
3
+
1
4
)×12=7           
3
5
÷0.6=1                         1.25×
4
5
×8=8.
点评:本题属于基本的计算,在平时都积累经验,逐步提高运算的速度和准确性.
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