小明今年8岁，爷爷的年龄是他的7倍还多4岁，爷爷今年多大年纪？)E8N7q9J9k(W;N0X.k9p
算式：提示2a/x1J.@+H7C-`5w/E7R)E8N7q9J9k(W;N0X.k9p
答；爷爷今年*h9~/y*a*w*|)[0u8y7j1H.k*L+k.e'~3C7Q,b'p:T岁。)E8N7q9J9k(W;N0X.k9p