问题
解答题
求未知数x.
|
答案
(1)70x-2.3×7=32.9,
70x-16.1+16.1=32.9+16.1,
70x÷70=49÷70,
x=0.7;
(2)
=60%,x 12
×12=60%×12,x 12
x=7.2;
(3)5:x=2.5:8,
2.5x=5×8,
2.5x=40÷2.5,
x=16.
求未知数x.
|
(1)70x-2.3×7=32.9,
70x-16.1+16.1=32.9+16.1,
70x÷70=49÷70,
x=0.7;
(2)
=60%,x 12
×12=60%×12,x 12
x=7.2;
(3)5:x=2.5:8,
2.5x=5×8,
2.5x=40÷2.5,
x=16.