脱式计算:16.40.81.226.90.25450.66.31.52.484.81.61.250.70.89.82536.724.259.951807.56242.42.50.8(41212389) 767115974469121492方程计算:3.851.5x6.13.6xx3.252(x3) 5.84x39297+x=19x+120=17658+x=90x+150=29024-3X=310X(5+1)=6099X=100-XX+3=18
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