3.5*[6.8-(1.6+3.6/0.9(]/84 怎么简算
3.5*[6.8-(1.6+3.6/0.9(]/84 怎么简算
直接算:
解:原式=3.5×(1.6+4)÷84
=3.5×5.6÷84
=19.6÷84
=30分之7
3.5*{6.8-(1.6+x/0.9)}=4.2怎么计算?
3.5﹛6.8-﹙1.6+x/0.9﹚﹜=4.2
6.8-1.6-x/0.9=4.2/3.5
-x/0.9=1.2-5.2
x=3.6
3.5*【6.8-(1.6+#/0.9)】/8.4=0.5#的值
解:方程3.5*【6.8-(1.6+#/0.9)】/8.4=0.5两边同乘以2,可得:
7*(6.8-1.6+ #/0.9)/8.4=1
7*(5.2+ #/0.9)=8.4
两边同除以7得:
5.2+ #/0.9=1.2
#/0.9=1.2-5.2
#/0.9=-4
解得: #=-3.6
(3.5 * (6.8 - 1.6 + (3.6 / 0.9))) / 84 请用简便演算法写清楚过程,谢谢
=3.5*(6.8-1.6+4)/84
=3.5*9.2/84
=23/60
3.5*[6.8-(1.6÷a÷0.9)]÷8.4=1求a
3.5*[6.8-(1.6÷a÷0.9)]÷8.4=1
3.5*[6.8-(1.6÷a÷0.9)]=1×8.4=8.4
[6.8-(1.6÷a÷0.9)]=8.4÷3.5=2.4
(1.6÷a÷0.9)=6.8-2.4=4.4
1.6÷a=4.4×0.9=3.96
a=1.6÷3.96
a=40/99
3.5*[6.8-(1.6+X/9)]/8.4=0.5
化简得:5(6.8-1.6-x/9)/12=1/2
所以26-5x/9=6
-5x/9=-20
x=36
3.5×[6.8-(1.6+x÷0.9)]÷8.4=0.5
3.5×[6.8-(1.6+x÷0.9)]÷8.4=0.5
两边乘以8.4
3.5×[6.8-(1.6+x÷0.9)]=4.2
两年除以3.5
6.8-(1.6+x÷0.9)=1.2
1.6+x÷0.9=6.8-1.2=5.6
x÷0.9=5.6-1.6=4
两边乘以0.9
x=4×0.9
x=3.6
3.5×【6.8-(1.6 星÷0.9)】=4.2星是多少
星是3.15带入得:
3.5×【6.8-(1.6*3.15÷0.9)】=4.2
望采纳,谢谢!
2.25*3.6+6.4/1.6怎么简算
2.25*3.6+6.4/1.6
=2.25×4×0.9+4
=9×0.9+4
=8.1+4
=12.1