解方程X＋3.5=85x=20.5x－4.8=23.56x÷3.6=8.27.4＋x=30x－308=6922.5x=75x÷6.4=203.6x=7.2x＋38.9=80x－2.4=21x÷34=2.7126÷X=4213+x=28.52.4X=26.410－x=8.53.5x=1402x+5=4013x－59.71=5.2954-X=244.2×3—3x=5.115x+6x=1685x＋1.5=4.57X－7=49x＋3.86=5.4617.89－x=12.8940.8＋x=57.33x＋2×6=302x＋0.828.2﹦3＋0.5x7﹦7.8÷x2.6﹦80x÷412﹦5＋0.9x275﹦2x＋0.4x=486＋6x=1835x＋13x=9.60.52×5＋4x=160.7(x＋0.9)=421.3x＋2.4×3=12.424x－8x＝28.878＋4x＝844.5×2＋5x＝1808x－7.2×5＝1213＋A＝28.5（7－1.4）x＝2.89x－5.2×6＝4.87x－0.8x＝9.3x÷0.84＝2.313＋x＝98.53x－24＝9x－0.84x＝0.8x÷0.26＝0.520.25x＋3.75＝12x＋1.8×2＝7.5x÷7.2＋3.8＝150.6x＋x＝2448＋5x＝6317.6＋2.4x＝505x－1.5x＝282x÷15＝4（6－2.5）x＝14.7（x－4.5）÷7＝1.66（x＋8.9）＝72（x＋8.6）÷2.4＝6.4x－0.3x－0.5x＝204（x－7.8）＝31.21.5（48－2x）＝48（x＋32）÷24＝2.54x－2×6＝44.8÷1.2＋0.5x＝8.52.5x－0.6×1.5＝6.616÷x＝84x＋2＝7×812.5x－0.9x＝52.22x＋2.8×2＝10.5×4简便运算（巧算）。2.5×（2.8×0.04）3.59×101（8×2.57）×1.2536×0.25＋64×0.250.125×320.04×29＋0.0489.7÷0.125÷0.810.27×2.4－10.27＋10.27×8.63.57＋1.9＋6.43＋6.198.2×101－98.20.125×32×0.599×2.453.75×99＋3.754.78－3.62－0.38＋5.221.69×3.3＋1.69×5.7＋1.6936×10.14.5×9.8（71.2－71.2×0.9）÷0.87.74×（2.8－1.3）＋1.5×2.2612.7×9.9＋1.273.65×43＋36.5×5.776÷0.25
