求未知数X:0.4X-0.4×10.8=20;13X+34X=1348;56:X=34:25.-数学
题文
求未知数X: 0.4X-0.4×10.8=20;
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答案
(1)0.4X-0.4×10.8=20, 0.4x-4.32=20, 0.4x-4.32+4.32=20+4.32, 0.4x=24.32, 0.4x÷0.4=24.32÷0.4, x=60.8; (2)
x=
(3)
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题文
求未知数X: 0.4X-0.4×10.8=20;
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答案
(1)0.4X-0.4×10.8=20, 0.4x-4.32=20, 0.4x-4.32+4.32=20+4.32, 0.4x=24.32, 0.4x÷0.4=24.32÷0.4, x=60.8; (2)
x=
(3)
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