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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)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.

①1.5×(0.1÷0.5)+0.18÷0.36=1.5×0.2+0.5=0.3+0.5=0.8;②14.55÷(0.72+4.76×3)=14.55÷(0.72+14.28)=14.55÷15=0.97;③800-(418+317)÷21×8.9=800-735÷21×8.9=800-35×8.9=800-311.5=488.5;④494÷19+15×24-125×2=26+360-250=136;⑤6.25×0.8+3.7...

(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...

(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)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)...

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...

(5/8)×(5/2)×(3/5)=15/16

2.1×0.5÷4.2的脱式计算 =(2.1/4.2)×0.5 =1/2×0.5 =1/2×1/2 =1/4

(1)46.5×99+46.5=46.5×(99+1)=46.5×100=4650(2)12.5÷2.5÷0.4=12.5÷(2.5×0.4)=12.5÷1=12.5(3)2.6×1.9÷2.6×1.9=2.6÷2.6×1.9×1.9=1×1.9×1.9=3.61(4)(7.7+1.54)÷0.7=9.24÷0.7=13.2(5)10.8÷[(4.62-1.92)×4]=10.8÷[2.7×4]=10.8÷10.8...

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