简便方法计算 1、412*81+11*925+537*19 2、7.28-4.16+2.92-1.84+7.08+4.723、2.5*0.72+36*0.172-0.072*114、4.2*12.5*0.25*165、8.5*2.3+1.8*1.5+0.5*15.5
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/06 00:09:37
![简便方法计算 1、412*81+11*925+537*19 2、7.28-4.16+2.92-1.84+7.08+4.723、2.5*0.72+36*0.172-0.072*114、4.2*12.5*0.25*165、8.5*2.3+1.8*1.5+0.5*15.5](/uploads/image/z/10475097-33-7.jpg?t=%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97+1%E3%80%81412%2A81%2B11%2A925%2B537%2A19+2%E3%80%817.28-4.16%2B2.92-1.84%2B7.08%2B4.723%E3%80%812.5%2A0.72%2B36%2A0.172-0.072%2A114%E3%80%814.2%2A12.5%2A0.25%2A165%E3%80%818.5%2A2.3%2B1.8%2A1.5%2B0.5%2A15.5)
简便方法计算 1、412*81+11*925+537*19 2、7.28-4.16+2.92-1.84+7.08+4.723、2.5*0.72+36*0.172-0.072*114、4.2*12.5*0.25*165、8.5*2.3+1.8*1.5+0.5*15.5
简便方法计算 1、412*81+11*925+537*19 2、7.28-4.16+2.92-1.84+7.08+4.72
3、2.5*0.72+36*0.172-0.072*11
4、4.2*12.5*0.25*16
5、8.5*2.3+1.8*1.5+0.5*15.5
简便方法计算 1、412*81+11*925+537*19 2、7.28-4.16+2.92-1.84+7.08+4.723、2.5*0.72+36*0.172-0.072*114、4.2*12.5*0.25*165、8.5*2.3+1.8*1.5+0.5*15.5
1. 412*81+11*925+537*19=(81+19)*412+(19+11)*125+800*11=41200+3750+8800=53750
2. 7.28-4.16+2.92-1.84+7.08+4.72=(7.28+2.92)-(4.16+1.84)+(7.08+4.72)=10.2-6+11.8=(10.2+11.8)-6=22-6=16
3. 2.5*0.72+36*0.182-0.072*11=(2.5-1.1)*0.72+36*0.172=1.4*0.72+3.6*(1+0.72)=(1.4+3.6)*0.72+3.6=5*0.72+3.6=3.6+3.6=7.2
4. 4.2*12.5*0.25*16=4.2*(12.5*4)*(0.25*4)=4.2*50*1=210
5. 8.5*2.3+1.8*1.5+0.5*15.5=8.5*(1.8+0.5)+1.8*1.5+0.5*15.5=1.8*(8.5+1.5)+0.5*(8.5+15.5)=1.8*10+0.5*24=18+12=30