解方程。+R'x)F7g3q4j4i;x6p.N:_
（1）x+39=120+R'x)F7g3q4j4i;x6p.N:_
算式：提示,},Z5A6M0b9c6S:p,?)y4J)S+R'x)F7g3q4j4i;x6p.N:_
x=)Q-k6{:E7c2c+R'x)F7g3q4j4i;x6p.N:_
（2）2.4x=7.2+R'x)F7g3q4j4i;x6p.N:_
算式：提示8o,y7_+R'x)F7g3q4j4i;x6p.N:_
x=0b5@4H6y,[8h8Q(O+a:P+R'x)F7g3q4j4i;x6p.N:_
（3）4.5x=27+R'x)F7g3q4j4i;x6p.N:_
算式：提示5A(d;F/H2z'J+K4n0u0L+R'x)F7g3q4j4i;x6p.N:_
x=;{2Q2[;o5E+`8w3M+R'x)F7g3q4j4i;x6p.N:_
（4）x÷100=0.56+R'x)F7g3q4j4i;x6p.N:_
算式：提示*K1?-C)}7^9F4m9Z9q-~*B*?7p+R'x)F7g3q4j4i;x6p.N:_
x=,Y1e.q+R'x)F7g3q4j4i;x6p.N:_