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8.1÷0.4+0.5的和乘以0.6脱式计算和简便算法

(8.1÷0.4+0.5)×0.6 =(8÷0.4+0.1÷0.4+0.5)×0.6 =(20+0.25+0.5)×0.6 =20×0.6+0.25×0.6+0.5×0.6 =12+0.15+0.3 =12.45

1.95.6*18+0.4*18 =(95.6+0.4)*18 =96*18 =1728 2.907*99+907 =907*(99+1) =907*100 =90700 3.0.6*143-0.6*43 =0.6*(143-43) =0.6*100 =60 4.6.5*8+3.5*8-47 =(6.5+3.5)*8-47 =80-47 =33 5.14*2.25+14*3.75 =(2.25+3.75)*14 =6*14 =84 6.3.5*0.8...

(1)0.8×0.25×4×0.5=(0.8×0.5)×(4×0.25)=0.4×1=0.4;(2)4.6×[3÷(1.45-1.05)]=4.6×[3÷0.4]=4.6×7.5=34.5;(3)55×9.9=55×(10-0.1)=55×10-55×0.1=550-5.5=544.5;(4)4.87×2.34+4.87×7.66=4.87×(2.34+7.66)=4.87×10=48.7.

2012年1月28日星期六一、口算题小数加法:0.3+1.5=2.5+9.8=7.6+1.3=4.4+5.7=2.3+7.7=5.7+3.1=7.69+2.31=9.16+2.64=5.68+12.22=16.8+16.5=小数减法:6.8-3.8=4.26-3.71=0.88-2.12=5.34-69.21=68.4-61.5=9.58-3.7=18.94-5.66=15.69-9.78=115-68.59...

见图

1.120-36×4÷18+35 2.(58+37)÷(64-9×5) 3.(6.8-6.8×0.55)÷8.5 4.0.12× 4.8÷0.12×4.8 5.(3.2×1.5+2.5)÷1.6 (2)3.2×(1.5+2.5)÷1.6 6.6-1.6÷4= 5.38+7.85-5.37= 7.7.2÷0.8-1.2×5= 6-1.19×3-0.43= 8.6.5×(4.8-1.2×4)= 0.68×1.9+0.32×1.9 ...

1. 0.4×125×25×0.8 =(0.4×25)×(125×0.8)=10×100=1000 2. 1.25×(8+10)=1.25×8+1.25×10 =10+12.5=22.5 3.9123-(123+8.8)=9123-123-8.8=9000-8.8=8991.2 4.1.24×8.3+8.3×1.76 =8.3×(1.24+1.76) =8.3×3=24.9 5.9999×1001=9999×(1000+1)=...

(1)1.6×55.4-55.4×0.6-55.4,=(1.6-0.6-1)×55.4,=0×55.4,=0;(2)17.68÷5.2+2.7×1.5,=3.4+4.05,=7.45;(3)4.8×0.25,=(1.2×4)×0.25,=1.2×(4×0.25),=1.2×1,=1.2.

(1)6.72-2.3÷0.5×0.8=6.72-4.6×0.8=6.72-3.68=3.04;(2)98-17+18-67=(98+18)-(17+67)=54-1=14;(3)910÷[12×(65-310)]=910÷[12×910]=910÷920=2;(4)(27+15)×7×5=27×7×5+15×7×5=10+7=17.

(1)6760÷13+17×25,=520+17×25,=520+425,=945;(2)4.82-5.2÷0.8×0.6,=4.82-6.5×0.6,=4.82-3.9,=0.92;(3) 5 6 - 3 4 ÷ 3 10 ,= 5 6 - 5 2 ,=- 5 3 ;(4)35÷ 7 8 ×1- 2 7 ,=40×1- 2 7 ,=40- 2 7 ,=39 5 7 .

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