①126又1/49÷25②(1+1/2+1/3+1/4)×(1/2+1/3+1/4+1/5)-(1+1/2+1/3+1/4+1/5)×(1/2+1/3+1/4)③48又7/10×999+48.7÷(2-1/2-1/3-1/6)④(1/5+1/7+1/9+1/11)×(1/7+1/9+1/11+1/13)-(1/5+1/7+1/9+1/11+1/13)×(1/7+1/9+1/11简便
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①126又1/49÷25②(1+1/2+1/3+1/4)×(1/2+1/3+1/4+1/5)-(1+1/2+1/3+1/4+1/5)×(1/2+1/3+1/4)③48又7/10×999+48.7÷(2-1/2-1/3-1/6)④(1/5+1/7+1/9+1/11)×(1/7+1/9+1/11+1/13)-(1/5+1/7+1/9+1/11+1/13)×(1/7+1/9+1/11简便
①126又1/49÷25
②(1+1/2+1/3+1/4)×(1/2+1/3+1/4+1/5)-(1+1/2+1/3+1/4+1/5)×(1/2+1/3+1/4)
③48又7/10×999+48.7÷(2-1/2-1/3-1/6)
④(1/5+1/7+1/9+1/11)×(1/7+1/9+1/11+1/13)-(1/5+1/7+1/9+1/11+1/13)×(1/7+1/9+1/11
简便计算啦!
①126又1/49÷25②(1+1/2+1/3+1/4)×(1/2+1/3+1/4+1/5)-(1+1/2+1/3+1/4+1/5)×(1/2+1/3+1/4)③48又7/10×999+48.7÷(2-1/2-1/3-1/6)④(1/5+1/7+1/9+1/11)×(1/7+1/9+1/11+1/13)-(1/5+1/7+1/9+1/11+1/13)×(1/7+1/9+1/11简便
①126又1/49÷25
=(125+1又1/49)÷25
=125÷25+50/49÷25
=5+2/49
=5又2/49
②(1+1/2+1/3+1/4)×(1/2+1/3+1/4+1/5)-(1+1/2+1/3+1/4+1/5)×(1/2+1/3+1/4)
=(1+1/2+1/3+1/4)(1/2+1/3+1/4+1/5)-(1/2+1/3+1/4)-(1/2+1/3+1/4)(1/2+1/3+1/4+1/5)
=(1/2+1/3+1/4+1/5)(1+1/2+1/3+1/4-1/2-1/3-1/4)-(1/2+1/3+1/4)
=(1/2+1/3+1/4+1/5)-(1/2+1/3+1/4)
=1/5
③48又7/10×999+48.7÷(2-1/2-1/3-1/6)
=48.7*999+48.7÷[2-(1/2+1/3+1/6)]
=48.7*999+48.7÷1
=48.7*(999+1)
=48700
④(1/5+1/7+1/9+1/11)×(1/7+1/9+1/11+1/13)-(1/5+1/7+1/9+1/11+1/13)×(1/7+1/9+1/11 )
同第2题