来自高志宇的问题
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 21:23
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=1.25×1.6,
0.25X÷0.25=1.25×1.6÷0.25,
X=8;
(4)X÷4=30%,
X÷4×4=30%×4,
X=1.2.