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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

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

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

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 =(0.1+0.9)+(0.2+0.8)+(0.3+0.7)+(0.4+0.6)+0.5 =1+1+1+1+0.5 =4.5

12.3× 0.8×0.5 =12.3×(0.8×0.5) =12.3×0.4 =4.92

0.5×2.5-1.2×120.5×2.5-0.8×12 =0.5×2.5-144.6×2.5-0.8×4×2.5 =0.5×2.5-144.6×2.5-3.2×2.5 =2.5×(0.5-144.6-3.2) =2.5×(-147.3) =-368.25

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) =...

12.4*3.2*0.8 =12.5*0.8*3.2-0.1*3.2*0.8 =32-0.256 =31.744 希望能帮到你,请采纳正确答案. 你的点赞或采纳是我继续帮助其他人的动力

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