来自伏永明的问题
求未知数X.X+X=42X:0.3=0.4:0.81.25:0.25=X:1.6X÷4=30%
求未知数X.X+X=42X:0.3=0.4:0.81.25:0.25=X:1.6X÷4=30%
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2020-12-06 20:22
求未知数X.X+X=42X:0.3=0.4:0.81.25:0.25=X:1.6X÷4=30%
求未知数X.X+X=42X:0.3=0.4:0.81.25:0.25=X:1.6X÷4=30%
(1)X+X=42,X=42,X÷=42÷,X=36,(2)X:0.3=0.4:0.8,0.8X=0.3×0.4,0.8X÷0.8=0.3×0.4÷0.8,X=0.15;(3)1.25:0.25=X:1.6,0.25X=1.25×1....