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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

8.1÷4.5÷0.2 =8.1÷(4.5×0.2) =8.1÷0.9 =9

5÷8÷0.4×(3÷5)=5÷(8÷0.4)×0.6=5÷20×0.6=0.25×0.6=0.15

(1)300-64×84÷28,=300-5276÷28,=300-192,=108;(2)4-1÷3- 1 3 ×8,=4- 1 3 - 8 3 ,=4-( 1 3 + 8 3 ),=4-3,=1;(3)(2 4 5 +0.6÷ 6 35 )×2.4,=(2 4 5 + 7 2 )×2.4,=6.3×2.4,=15.12;(4)[1 1 8 -( 13 20 +0.35)÷1 1 7 ]×...

(1)0.233-(0.133-57)+27,=0.233-0.133+57+27,=(0.233-0.133)+(57+27),=0.1+1,=1.1;(2)4.62+9.9+5.38+0.1,=(4.62+5.38)+(0.1+9.9),=10+10,=20;(3)4×0.6+0.6÷14,=4×0.6+0.6×4,=0.6×(4+4),=0.6×8,=4.8;(4)0.38×7...

(1)4.82-5.2÷0.8×0.6=4.82-6.5×0.6=4.82-3.9=0.92;(2)0.8×[1÷(3.2-2.95)]=0.8×[1÷0.25]=0.8×4=3.2;(3)(34+58-12)÷116 =(118-12)÷116=78×16=14;(4)2013×(12011-12013)×2011=2013×2011×(12011-12013)=2013×2011×12011-2013×2...

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...

(1)6.8×0.75÷0.5=5.1÷0.5=10.2(2)0.94÷1.25÷0.8=0.94÷(1.25×0.8)=0.94÷1=0.94(3)0.5×4÷0.5×4=(0.5÷0.5)×(4×4)=1×16=16(4)29.4÷7+3.6=4.2+3.6=7.8(5)(7.5-2.3×0.4)÷0.01=(7.5-0.92)÷0.01=6.58÷0.01=658(6)9÷[0.3×(8-6.5)...

(5/8)×(5/2)×(3/5)=15/16

(1)4.85×1.25×8 =4.85×(1.25×8)=4.85×10=48.5(2)6.8÷[(4.5-2.8)×0.4]=6.8÷[1.7×0.4]=6.8÷0.68=10(3)39÷0.125÷0.8=39÷(0.125×0.8)=39÷0.1=390 (4)4.8×0.65+0.65×5.2=0.65×(4.8+5.2)=0.65×10=6.5

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