用简便方法计算下面各题.51x101-51.99x56?
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1,=(43.6+6.4)+9.8=59.8再答:2,=17.3����0.25��8��=17.3��2=34.6再答:3,=(2.31+7.69)��1.5=10��1.5=15
=(72.6+27.4)×0.3=100×0.3=30
(1)2+4+6+…+18+20,=(2+20)×10÷2,=22×10÷2,=110;(2)20-19+18-17+…+4-3+2-1,=(20-19)+(18-17)+…+(4-3)+(2-1),
4037-1370-6300=4037-(1370+6300)=4037-7670=-3633{这样基本没什么简便算法,否则可能还折腾麻烦}如果是4037-1370-630则原式=4037-(1370
=3.1*(1.2*0.5)=3.1*0.6=1.86
7/5-5/12-7/12=7/5-(5/12+7/12)=7/5-1=2/53/8+7/13+5/8=(3/8+5/8)+7/13=1+7/13=20/137/9+(2/9-3/13)=7/9+2/
7.4×9.8-14.5,=7.4×(10-0.2)-14.5,=7.4×10-7.4×0.2-14.5,=74-1.48-14.5,=58.02;13.4+5.62+17.6+4.38,=(13.4
15-5÷12-7/12=15-5/12-7/12=15-(5/12+7/12)=15-1=142-1/4-1/3-3/4=2-1/4-3/4-1/3=2-(1/4+3/4)-1/3=2-1-1/3=
1.用简便方法计算下面各题(脱式)5.6÷0.32=5.6÷0.8÷0.4=7÷0.4=15100.1×23=100×23+0.1×23=2300+2.3=2302.37/13+3/4-6/13=7/
1、199.199*198-198.198*199=1.001*199*198-1.001*198*199=02、18.9*178.178+0.49-17.8*189.189=189*0.1*178*
721010.93930.240.97130(1)178169(2)中位数(3)164.5再问:要过程!!!不要只给答案!!!
0.9+0.99+0.999+0.9999+0.99999=1-0.1+1-0.01+1-0.001+1-0.0001+1-0.00001=5-0.11111=4.888892.2+3.3+4.4+5
0.37*2.5*4=0.37*10=3.74.35*1.25*80=4.35*100=4350.372*0.4*50=0.372*20=7.44102*3.6=(100+2)*3.6=360+7.2
(5/11+3/8)x88=5/11x88+3/8x88=40+33=7317x3/8-3/8=(17-1)x3/8=16x3/8=610-2/7÷9/14-5/9=10-2/7x14/9-5/9=1
7分之6-9分之7+7分之8=6/7+8/7-7/9=2-7/9=11/918分之17-10分之3-5分之1=17/18-(3/10+1/5)=17/18-1/2=8/18=4/99分之5-12分之5
0.98-0.036-0.064=0.98-(0.036+0.064)=0.98-0.1=0.888.57×103-8.57×3=8.57×(103-3)=8.57×100=8571.01×1.01-
6.48/(1.8*0.45)/250=6.48/0.45/(1.8*250)=14.4/450=0.32(3.12+0.9)/(1-0.4)=(3.12+0.9)/0.6=3.12/0.6+0.9/
0.9+0.99+0.999+0.9999+0.99999=5-(0.1+0.01+0.001+0.0001+0.00001)=5-0.11111=4.88889
9÷0.125=9*1/8=9/825.25×0.65×4÷0.65=25.25*4*(0.65/0.65)=25.25*4*1=1010.485×102-48.5=48.5*1.02-48.5=48
144又25分之12÷12=(144+12/25)×1/12=144×1/12+12/25×1/12=12+1/25=12又1/25(9又7分之2+7又9分之2)÷(7分之5+9分之5)=(9+2/7