ldcf.net
当前位置:首页 >> 1.72X1.4÷1.72X1.4(简便算法) >>

1.72X1.4÷1.72X1.4(简便算法)

原式=1.72*1.4*1/1.72*1.4=1.4*1.4=1.96

12.6x7.6x2.32➗1.9➗1.4➗2.9如何用简便计算? 12.6x7.6x2.32➗1.9➗1.4➗2.9 =(12.6÷4)*(7.6÷1.9)*(2.32÷2.9) =3.15*4*0.8 =10.08

(1)6x+15×7=141, 6x+105-105=141-105, 6x÷6=36÷6, x=6;(2)2x÷2.8=8.2,2x÷2.8×2.8=8.2×2.8, 2x÷2=22.96÷2, x=11.48;(3)1.4x-0.7x=56, 0.7x=56, 0.7x÷0.7=56÷0.7, x=80.

1.56×1.7+0.44×1.4 =1.56×1.7+0.44×1.7-0.44×0.3 =1.7×(1.56+0.44)-0.132 =1.7×2-0.132 =3.4-0.132 =3.268

(1)6.9x-4.1=9.7, 6.9x-4.1+4.1=9.7+4.1, 6.9x÷6.9=13.8÷6.9, x=2;(2)2(x+1.7)=9.2, 2(x+1.7)÷2=9.2÷2, x+1.7-1.7=4.6-1.7, x=2.9;(3)4.5x+2=15.5, 4.5x=2-2=15.5-2, 4.5x÷4.5=13.5÷4.5, x=3;(4)9x-5x=0.64, 4x=0.64,...

x=7-1.2 x=5.8 x=12.6➗6 x=2.1

6.3x((1.4+a)/1.12-1.2)=7.56 (1.4+a)/1.12-1.2=1.2 (1.4+a)/1.12=2.4 1.4+a=2.688 a=1.288

【1】1.4×7+x=12.8 x=12.8-9.8; x=3; 【2】(6+3x)÷4=9; 6+3x=36; 3x=30; x=10; 【3】5分之2x+2分之1=24分之19 2x/5=19/24-12/24; 2x/5=7/24; x=35/48; 【4】18÷4x-3=9(有补充!) 18÷4x=12; 4x=18/12; 4x=3/2; x=3/8; 【5】3.4+9.8=1.4+9x 9x...

7.2÷(x-1.4)=1.2 解:x-1.4=7.2÷1.2 x-1.4=6 x=6+1.4 x=7.4

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