rpct.net
当前位置:首页 >> 3.2Ⅹ9.9 0.32脱式计算,能简算的要简算 >>

3.2Ⅹ9.9 0.32脱式计算,能简算的要简算

4.8x9.9脱式计算能简算要简算 4.8x9.9 =4.8*10-4.8*0.1 =48-0.48 =47.52

6.8×9.9 =6.8×(10-0.1) =6.8×10-6.8×0.1 =68-0.68 =67.32

7.8×9.9脱式计算(能简便的就简便) 7.8×9.9 =7.8*(10-0.1) =7.8*10-7.8*0.1 =78-0.78 =77.22

5.7x9.9 =5.7x(100一0.1) =5.7x100-5.7x0.1 =570-0.57 =569.43

1.9+19点9+199点9+0点3 =2-0.1+20-0.1+200-0.1+0.3 =(2+20+200)-(0.1+0.1+0.1)+0.3 =222-0.3+0.3 =222

=0.38x(0.6+9.4) =3.8 乘法分配律

=(2/9)*(10/3) =20/27

(1)0.8×3.9×1.25=0.8×1.25×3.9=1×3.9=3.9(2)4.87×2.34+4.87×7.66=4.87×(2.34+7.66)=4.87×10=48.7(3)0.49×9.9=0.49×(10-0.1)=0.49×10-0.49×0.1=4.9-0.049=4.851(4)60.8-7.18-12.82=60.8-(7.18+12.82)=60.8-20=40.8(5)2.5×3.2×12...

原式=8/9÷(4/3-2/3) =8/9÷2/3 =8/9 ×3/2 =4/3

(1) 9 32 ÷[ 3 4 -( 7 16 - 1 4 )] ,= 9 32 ÷[ 3 4 + 1 4 - 7 16 ],= 9 32 ÷[1- 7 16 ],= 9 32 ÷ 9 16 ,= 1 2 ;(2) 3 5 ×( 1 7 + 8 21 ÷ 2 3 ) ,= 3 5 ×( 1 7 + 4 7 ),= 3 5 × 5 7 ,= 3 7 ;(3)200.5+9.9×2005,=2005×0.1+9.9×...

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