题目内容
解比例.
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3:8=24:x | 15:3=12:x | ||||||||||||||
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(1)
=
,
10x=6×7,
10x=42,
10x÷10=42÷10,
x=4.2;
(2)3:8=24:x,
3x=8×24,
3x=192,
3x÷3=192÷3,
x=64;
(3)15:3=12:x,
15x=3×12,
15x=36,
15x÷15=36÷15,
x=2.4;
(4)
:
=x:
,
x=
×
,
x=
,
x÷
=
÷
,
x=
;
(5)
=
,
2x=22.4×3,
2x=67.2,
2x÷2=67.2÷2,
x=33.6;
(6)
=
,
2.5x=12.5×8,
2.5x=100,
2.5x÷2.5=100÷2.5,
x=40.
6 |
x |
10 |
7 |
10x=6×7,
10x=42,
10x÷10=42÷10,
x=4.2;
(2)3:8=24:x,
3x=8×24,
3x=192,
3x÷3=192÷3,
x=64;
(3)15:3=12:x,
15x=3×12,
15x=36,
15x÷15=36÷15,
x=2.4;
(4)
3 |
4 |
9 |
10 |
3 |
5 |
9 |
10 |
3 |
4 |
3 |
5 |
9 |
10 |
9 |
20 |
9 |
10 |
9 |
10 |
9 |
20 |
9 |
10 |
x=
1 |
2 |
(5)
22.4 |
x |
2 |
3 |
2x=22.4×3,
2x=67.2,
2x÷2=67.2÷2,
x=33.6;
(6)
12.5 |
2.5 |
x |
8 |
2.5x=12.5×8,
2.5x=100,
2.5x÷2.5=100÷2.5,
x=40.
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