解方程．（1）x÷127=78（2）9.1-325x=0.6（3）10×（2914+1121）÷434（4）1223-412÷634+314×157（5）6.23×[1÷（2110-2.09）]（6）[3.6-（12+2.3）×37]÷4.2．

Question

解方程．

（1）x÷1(2)/(7)=(7)/(8)	（2）9.1-3(2)/(5)x=0.6
（3）10×（2(9)/(14)+(11)/(21)）÷4(3)/(4)	（4）12(2)/(3)-4(1)/(2)÷6(3)/(4)+3(1)/(4)×1(5)/(7)
（5）6.23×[1÷（2(1)/(10)-2.09）]	（6）[3.6-（(1)/(2)+2.3）×(3)/(7)]÷4.2．

Answer 1

（1）x÷1(2)/(7)=(7)/(8)
     x÷1(2)/(7)×1(2)/(7)=(7)/(8)×1(2)/(7)
            x=1(1)/(8)

（2）9.1-3(2)/(5)x=0.6
9.1-3(2)/(5)x+3(2)/(5)x-0.6=0.6+3(2)/(5)x-0.6
             8.5=3(2)/(5)x
             3(2)/(5)x=8.5
         3(2)/(5)x÷3(2)/(5)=8.5÷3(2)/(5)
                x=2.5

（3）10×（2(9)/(14)+(11)/(21)）÷4(3)/(4)
=10×(133)/(42)×(4)/(19)
=6(2)/(3)

（4）12(2)/(3)-4(1)/(2)÷6(3)/(4)+3(1)/(4)×1(5)/(7)
=12(2)/(3)-(2)/(3)

作业帮用户 2016-11-30