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脱式计算8.4×0.26

(1)8.4×0.26+58=2.184+0.625,=2.809.(2)34+76-17=2312?17,=14984;(3)31.7-0.5×0.7-1.65=31.7-0.35-1.65,=31.7-(0.35+1.65),=31.7-2,=29.7.(4)0.8×(3.2-15)=0.8×(3.2-0.2),=0.8×3,=2.4;(5)42.3×18+7.7×18=(42.3+7.7...

7.8÷0.26÷0.3 =7.8÷(0.26×0.3) =7.8÷0.078 =100

380÷(26-24)×0.5 =380÷2×0.5 =190×0.5 =95

=12.5÷0.4=31

0.26*70.75/65/2.83 =18.395÷65÷2.83 =0.283÷2.83 =0.1

(1)0.26×2.5+0.74×2.5-2.5=(0.26+0.74-1)×2.5=0×2.5=0;(2)0.25×12.5×1.6=0.25×12.5×8×0.2=(0.25×0.2)×(12.5×8)=0.05×100=5;(3)17.64÷4.9+6.73=3.6+6.73=10.33;(4)10.1×87=(10+0.1)×87=10×87+0.1×87=870+8.7=878.7.

脱式计算 0.26×70.7÷6.5÷2.8 =(0.26÷6.5)×(70.7÷2.8) =0.4×25.25 =10.1

原式等于: x-10=5x-130 120=4x x=30

30-28+26-24+22-20+…+6-4+2-0因为每一档计算结果是2你只要知道有几档就行,一共八档所以: =2x8 =16

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...

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