Question

解方程． (1)0.16x+0.4x=8.4 (2)12.5+8+x=30.4 (3)0.6×95﹣4.8x=31.08

Answer 1

(1)0.16x+0.4x=8.4         解:0.56x=8.4    0.56x÷0.56=8.4÷0.56                     x=15

(2)12.5+8+x=30.4    解: 20.5+x=30.4 20.5+x-20.5=30.4-20.5                   x=9.9

(3)0.6×95﹣4.8x=31.08         解:57﹣4.8x=31.08     57﹣4.8x+4.8x=31.08+4.8x           31.08+4.8x=57 31.08+4.8x-31.08=57﹣31.08               4.8x÷4.8=25.92÷4.8                           x=5.4