5÷1=____ 62-30=____ 6+55=____ 20÷4=____
8÷2=____ 4×3=____ 5×4=____ 16-9=____
已知M=m+3m-4是m+3的算术平方根,N=n-22m-4n+3是n﹣2的立方根,试求M﹣N的值.
, I broke your glasses just now?