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脱式计算(能简算的要简算).(1)25.4×1.25×0.8...

(1)1.25×8.37×0.8 =1.25×0.8×8.37,=1×8.37,=8.37;(2)(9-2.35)×0.64=6.65×0.64,=4.256;(3)0.25×32×12.5=(0.25×4)×(8×1.25),=1×10,=10;(4)0.15×1999+0.15 =(1+1999)×0.15,=2000×0.15,=300;(5)0.37×1.4-0.4×0.37=(1....

(1)1.08×0.8÷0.27=1.08÷0.27×0.8,=4×0.8,=3.2;(2)102×0.45=(100+2)×0.45,=100×0.45+2×0.45,=45+0.9,=45.9;(3)22.78÷1.25÷0.8=22.78÷(1.25×0.8),=22.78÷1,=22.78;(4)0.34×101-0.34=(101-1)×0.34,=100×0.34,=34.

(1)(19.75-14.25)÷1.1+52=5.5÷1.1+52=5+52=57;(2)1.25×7.3×0.8=1.25×0.8×7.3=1×7.3=7.3;(3)8.37×17.2-8.37×7.2=8.37×(17.2-7.2)=8.37×10=83.7;(4)4.32×101-4.32=4.32×(100-1)=4.32×100=432.

(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.

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

(1)0.4×5÷0.4×5,=2÷0.4×5,=5×5,=25;(2)8×25×125×40,=(8×125)×(25×40),=1000×1000,=1000000;(3)(14+1415)-1415,=14+1415-1415,=14+(1415-1415),=14+0,=14.

①4.5×102, =4.5×(100+2), =4.5×100+4.5×2, =450+9, =459; ②0.85×6.7+3.3×0.85, =(6.7+3.3)×0.85, =10×0.85, =8.5; ③0.25×4.87×4, =(0.25×4)×4.87, =1×4.87, =4.87; ④25.8-1.58×0.65, =25.8-1.027, =24.773. 原理及解决简...

(1)8.08×1.25=(8+0.08)×1.25=8×1.25+0.08×1.25=10+0.1=10.1(2)49.5×101-49.5=49.5×(101-1)=49.5×100=4950(3)4.6+5.6×0.83=4.6+4.648=9.248(4)12.8+2.04×9.5=12.8+19.38=32.18(5)22-1.6×7 =22-11.2=10.8(6)2.5×0.6-1.8×0.5=1.5-0...

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...

1.46×5+12.8÷0.4×7.5 =1.46×5+3.2×7.5 =1.46x5+3.2x1.5x5 =1.46x5+4.8x5 =(1.46+4.8)x5 =6.26x5 =31.3 希望帮到你 望采纳 谢谢 加油

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