问题
解答题
解方程:
y-25=15
0.4x÷O.3=7.2
6x-3x=4.8.
答案
(1)y-25=15,
y-25+25=15+25,
y=40;
(2)0.4x÷O.3=7.2,
0.4x÷O.3×0.3=7.2×0.3,
0.4x=2.16,
0.4x÷0.4=2.16÷0.4,
x=5.4;
(3)6x-3x=4.8,
3x=4.8,
3x÷3=4.8÷3,
x=1.6.
解方程:
y-25=15
0.4x÷O.3=7.2
6x-3x=4.8.
(1)y-25=15,
y-25+25=15+25,
y=40;
(2)0.4x÷O.3=7.2,
0.4x÷O.3×0.3=7.2×0.3,
0.4x=2.16,
0.4x÷0.4=2.16÷0.4,
x=5.4;
(3)6x-3x=4.8,
3x=4.8,
3x÷3=4.8÷3,
x=1.6.