求未知数X. (1)54:1.4=75%:X (2)4X
求未知数X.(1)54:1.4=75%:X(2)4X+5×0.7=9.5(3)35:X=13:2(4)3.2x-4×3=52....
求未知数X. (1)54:1.4=75%:X (2)4X+5×0.7=9.5 (3)35:X=13:2 (4)3.2x-4×3=52.
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(1)
:1.4=75%:X,
X=1.4×75%,
X×
=1.05×
,
X=0.84;
(2)4X+5×0.7=9.5,
4X+3.5=9.5,
4X+3.5-3.5=9.5-3.5,
4X÷4=6÷4,
X=1.5;
(3)
:X=
:2,
X=
×2,
X×3=
×3,
X=
;
(4)3.2x-4×3=52,
3.2x-12=52,
3.2x-12+12=52+12,
3.2x÷3.2=64÷3.2,
x=20.
5 |
4 |
5 |
4 |
5 |
4 |
4 |
5 |
4 |
5 |
X=0.84;
(2)4X+5×0.7=9.5,
4X+3.5=9.5,
4X+3.5-3.5=9.5-3.5,
4X÷4=6÷4,
X=1.5;
(3)
3 |
5 |
1 |
3 |
1 |
3 |
3 |
5 |
1 |
3 |
6 |
5 |
X=
2 |
5 |
(4)3.2x-4×3=52,
3.2x-12=52,
3.2x-12+12=52+12,
3.2x÷3.2=64÷3.2,
x=20.
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