题目内容
12.56-1.6×5-2.7=
[ ]
A.6.5
B.8.3
C.1.875
D.1.86
答案:D

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解比例.
(1)12:x=
:
(2)x:7.5=0.028:
(3)0.4:x=(1+
):5
(4)4:
=x:6.5
(5)
=
(6)0.8:3
=(5-x):0.75.
(1)12:x=
1 |
8 |
3 |
4 |
(2)x:7.5=0.028:
3 |
4 |
(3)0.4:x=(1+
1 |
7 |
(4)4:
5 |
6 |
(5)
x |
0.15 |
2 |
1.25 |
(6)0.8:3
3 |
4 |
12.56
-1.6×5-2.7=[
]
A .6.5 |
B .8.3 |
C .1.875 |
D .1.86 |