计算下面各题,能简便算的要简算17.68/5.2+3.7 2.4*0.75+1.25/2.5 3.6*1.25+0.32/4 7.8-1.9+8.2-8.1 7.3*1.24+8.78*7.3
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计算下面各题,能简便算的要简算17.68/5.2+3.7 2.4*0.75+1.25/2.5 3.6*1.25+0.32/4 7.8-1.9+8.2-8.1 7.3*1.24+8.78*7.3
计算下面各题,能简便算的要简算
17.68/5.2+3.7 2.4*0.75+1.25/2.5 3.6*1.25+0.32/4 7.8-1.9+8.2-8.1 7.3*1.24+8.78*7.3
计算下面各题,能简便算的要简算17.68/5.2+3.7 2.4*0.75+1.25/2.5 3.6*1.25+0.32/4 7.8-1.9+8.2-8.1 7.3*1.24+8.78*7.3
1、
=3.4+3.7
=7.1
2、
=2.4*3/4+0.5
=1.8+0.5
=2.3
3、
=3.6*5/4+0.08
=4.5+0.08
=4.58
4、
=(7.8+8.2)-(1.9+8.1)
=16-10
=6
5、
=7.3*(1.24+8.78)
=7.3*10.02
=7.3*(10+0.02)
=7.3*10+7.3*0.02
=73+0.146
=73.146
17.68/5.2+3.7=3.4+3.7=7.1
2.4*0.75+1.25/2.5=2.4*3/4+1.25*2/5=1.8+0.5=2.3
3.6*1.25+0.32/4=3.6*5/4+0.32*1/4=4.5+0.08=4.58
7.8-1.9+8.2-8.1 =(7.8+8.2)-(1.9+8.1)=16-10=6
7.3*1.24+8.78*7.3=7.3*(1.24+8.78)=7.3*10.02=74.146(应该是8.76吧 楼主是不是写错了）
17.68/5.2+3.7 = 3.4 + 3.7 = 7.1
2.4*0.75+1.25/2.5 = 2.4* 3/4 + 1/2 = 1.8 +0.5 = 2.3
3.6*1.25+0.32/4 = 0.9*4*1.25 + 0.08 = 0.9* 5 +0.08 = 4.58
7.8-1.9+8.2-8.1 = 7.8+8.2-（1.9+8.1）= 16 - 10 = 6
7.3*1.24+8.78*7.3 = 7.3*(1.24+8.78) = 7.3* 10.02 = 73+7.3*0.02 = 73.146