ldcf.net
当前位置:首页 >> 脱式计算能简算的要简算2.5×1.6×1.25 >>

脱式计算能简算的要简算2.5×1.6×1.25

脱式计算能简算的要简算2.5×1.6×1.25 2.5×1.6×1.25 =2.5×2×0.8×1.25 =5×1 =5

2.5×1.6×1.25 =2.5x(1+0.6)x1.25 =(2.5+2.5x0.6)x1.25 =(2.5+1.5)x1.25 =4x1.25 =5

1.25×8点八 =12.5×8×1.1 =100×1.1 =110

①1.25×4.8,=1.25×8×0.6,=10×0.6,=6; ②5.5×9.9+0.1×5.5,=(9.9+0.1)×5.5,=10×5.5,=55; ③3.45×102,=3.45×(100+2),=3.45×100+3.45×2,=345+6.9,=351.9;④3.17+0.83×1.6,=3.17+1.328,=4.498.

(1)2.5×7.1×4,=(2.5×4)×7.1,=10×7.1,=71;(2)16.12×99+16.12,=16.12×(99+1),=16.12×100,=1612;(3)5.2×0.9+0.9×4.8,=0.9×(5.2+4.8),=0.9×10,=9;(4)[113-(34.15+38.25)]÷2,=[113-72.4]÷2,=40.6÷2,=20.3;(5)3.6÷...

(1)1305-386-614,=1305-(386+614),=1305-1000,=305;(2)(14+23-56)×12,=14×12+23×12-56×12,=3+8-10,=1; (3)1.25×32×2.5,=(1.25×8)×(4×2.5),=10×10,=100;(4)10.9-(45+9.6÷4),=10.9-(45+2.4),=10.9-3.2,=7.7.

1.6×2.5×7.5 =0.8x2x2.5x7.5 =0.8x2.5x(2x7.5) =2x15 =30 谢谢,请采纳

①7.69×2.1+2.1×1.31+2.1=(7.69+1.31+1)×2.1=10×2.1=21②18-(1.4+1.25×2.4)=18-(1.4+1.25×8×0.3)=18-[1.4+(1.25×8)×0.3]=18-[1.4+3]=18-4.4=13.6③7.2÷1.6+0.8=4.5+0.8=5.3④4×4.5-3X=6.33 18-3x=6.38 18-3x+3x=6.33+3x 3x+6.33=183x+6.33-6...

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×...

网站首页 | 网站地图
All rights reserved Powered by www.ldcf.net
copyright ©right 2010-2021。
内容来自网络,如有侵犯请联系客服。zhit325@qq.com