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0.2,0.3,0.5,0.8,1.3,2.1()怎么巧算

0.3-0.2=0.1 0.5-0.3=0.2 0.8-0.5=0.3 1.3-0.8=0.5 2.1-1.3=0.8 ()-2.1=1.3 ()=3.4

10-0.1-0.2-0.3-0.4-0.5-0.6-0.7-0.8-0.9=5.5

第一步:计算1×2×3×4×5×6×7×8×9=362880 第二步:查看共有几位小数:9位 第三部:从右往左数九位,不足的位用0代替,确定小数点位置,结果:0.000362880

5.2×0.8×2.6 =4.16×2.6 =4.16×3-4.16×0.4 =12.48-1.664 =12.48-2+0.336 =10.816

0.1*0.2*0.3*0.4*0.5*0.6*0.7*0.8*0.9怎样巧算

1、3.125×0.4×0.8×0.25 =(3.125×0.8)×(0.4×0.25) =2.5×0.1 =0.25 2、(0.8×1.2+0.8×0.05)×3.4 =0.8×(1.2+0.05)×3.4 =0.8×1.25×3.4 =1×3.4 =3.4 3、72÷2.5 =(72×4)÷(2.5×4) =288÷10 =28.8 4、111.1÷1.11×3.33 =111.1×(3.33÷1.11) =...

0.8+0.2÷0.01×4.5 =0.8+20×4.5 =0.8+90 =90.8

括号8.5-5.7括号乘2.15+0.8 =2.8x2.15+0.8 =(3-0.2)x2.15+0.8 =3x2.15-0.2x2.15+0.8 =6.45-0.43+0.8 =6.02+0.8 =6.82

4个数一循环,2014÷4=503余2, 1+2,先去掉前两个数。后面就是-3-4+5+6.。。。。-2011-2012+2013+2014 4个一组,和是4,共503个,即4+4+4+。。。。。。 所以503×4再加上前面的+1+2 =503×4+1+2=2015

=6.5×(1-0.2)+0.8 =6.5×0.8+0.8 =(6.5+1)×0.8 =7.5×0.8 =6

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