题目内容
【题目】下面各题,怎样算简便就怎样算
3.9+0.56+6.1+0.44 40.5×21.5+59.5×21.5
0.4×[(0.75+0.65)÷0.56] 9.1÷0.4÷2.5
【答案】11;2150;1;9.1
【解析】
3.9+0.56+6.1+0.44 40.5×21.5+59.5×21.5
=(3.9+6.1)+(0.56+0.44) =21.5×(40.5+59.5)
=10+1 =21.5×100
=11 =2150
0.4×[(0.75+0.65)÷0.56] 9.1÷0.4÷2.5
= 0.4×[1.4÷0.56] = 9.1÷(0.4×2.5)
=0.4×2.5 =9.1÷1
=1 =9.1
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