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38×8+6×388×4的简便方法脱式计算咋写?

38×8+6×38-38×4 =38×(8+6-4) =38×10 =380

①11.23-3.4+8.77-6.6=11.23+8.77-(3.4+6.6)=20-10=10;②5.4÷[0.68÷(1.2-1.03)]=5.4÷[0.68÷0.17]=5.4÷4=1.35;③(3.24×99+3.24)÷8.1 =[3.24×(99+1)]÷8.1=324÷8.1=40;④(18.4-3.75)÷12.5÷0.8=14.65÷12.5÷0.8=14.65÷(12.5×0.8)=14.65÷10...

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...

13×8×5×6的积除以4×5乘六的积等 =13*(8÷4)*(5÷5)*(6÷6) =13*2*1*1 =26

(1)、1.75×0.375-5/8÷4/7=7/4×3/8-5/8×7/4=(21-35)/32=-7/16=-7/8×1/2=-(1-1/8)×1/2=-(1-0.125)×1/2=-0.875×1/2=-0.4375 (2)、6(1/5)×(97-14.25÷50%)=31/5×(97-28.5)=31/5×(100-3-30+1.5)=31/5×68.5=(30+1+1/5)×68.5=3×685+68.5+68.5×0.2=2055+6...

6.5×2.4-6.5+6.5×8.6 =6.5×(2.4-1+8.6) =6.5×10 =65

①12× 3 8 ÷ 3 4 =12× 3 8 × 4 3 =6;② 4 9 + 5 9 ×9= 4 9 +5=5 4 9 ;③14÷( 1 3 + 5 6 )× 3 4 =14÷ 7 6 × 3 4 =14× 6 7 × 3 4 =9;④3.6-2.8+16.4-7.2=(3.6+16.4)-(2.8+7.2)=20-10=10;⑤77× 4 5 +23×0.8=(77+23)×0.8=100×0.8=80.

2.08×60 =2*60+0.08*60 =120+4.8 =124.8 ,2.5×0.6-1.8×0.5 =1.5-0.9 =0.6

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...

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