
解方程或比例.15:8=0.75:x3.2x-4×3=5
1个回答
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(1)
:8=0.75:x,
x=0.75×8,
x÷
=6÷
,
x=30;
(2)3.2x-4×3=52,
3.2x-12=52,
3.2x-12+12=52+12,
3.2x=64,
x=20;
(3)4×(x+0.7)=4.36,
4x+2.8=4.36,
4x+2.8-2.8=4.36-2.8,
4x=1.56,
4x÷4=1.56÷4,
x=0.39.
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x=30;
(2)3.2x-4×3=52,
3.2x-12=52,
3.2x-12+12=52+12,
3.2x=64,
x=20;
(3)4×(x+0.7)=4.36,
4x+2.8=4.36,
4x+2.8-2.8=4.36-2.8,
4x=1.56,
4x÷4=1.56÷4,
x=0.39.
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