求未知数X14+2X=12X8=0.24:129×3-1.7X=13.412÷(X+14)=1.2.-数学
题文
求未知数X
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答案
(1)
2x÷2=
x=
(2)
x=3.84; (3)9×3-1.7x=13.4, 27-1.7x=13.4, 27-1.7x+1.7x=13.4+1.7x, 13.4+1.7x=27, 13.4+1.7x-13.4=27-13.4, 1.7x=13.6, 1.7x÷1.7=13.6÷1.7, x=8; (4)12÷(x+
12÷(x+
1.2×(x+
1.2×(x+
x+
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