解方程X+25%X=50 7 8 :X=20% 30%X-2.6=6.4.

解方程X+25%X=50 7 8 :X=20% 30%X-2.6=6.4.
2025-05-21 04:16:13
推荐回答(1个)
回答(1):

(1)X+25%X=50,
1.25X=50,
1.25X÷1.25=50÷1.25,
X=40;

(2)
7
8
:X=20%,
0.2X=
7
8

0.2X÷0.2=
7
8
÷0.2,
X=
35
8


(3)30%X-2.6=6.4,
0.3X-2.6+2.6=6.4+2.6,
0.3X÷0.3=9÷0.3,
X=30.