=-4+1/4-0.7÷4=-15/4-7/40=-157/40
-2²-[-1/4+(1-1/5×0.6)÷（-2）²] =-4-[-1/4+(1-3/25)÷4]=-4-(-1/4+22/25÷4)=-4-（-3/100）=-3.97
