X－2/7X=3/470%X + 20%X = 3.6 25% + 10X =4/5X - 15%X = 68 X＋3/8 X＝1215X－3×5/21 ＝5/116X＋5 =13.4 X÷(6/35) =(26/45) ×(13/25)2(x-0.6)=4(0.5+x)+x=9.8÷2 2(X+X+0.5)=9.8 25000+x=6x 3200=450+5X+X X-0.8...递等式的也要0.64×25×7.8+2.2 2÷2.5+2.5÷2 194－64.8÷1.8×0.9 36.72÷4.25×9.9 5180－705×6 24÷2.4－2.5×0.8 (4121+2389)÷7 671×15-974 469×12+1492 405×(3213-3189)够么？不够我再给你找去。