脱式计算，能简算的用简便方法计算。5\7p4d6B5E'y
（1）7.2÷1.8+6.5+0.5=)O:i*k/V*K2|8C,E8e2?5\7p4d6B5E'y
算式：提示;n:d.}/n/m9A;r-r5\7p4d6B5E'y
（2）5.6×12.5×0.8='Z;d,k;{;|.O4L5\7p4d6B5E'y
算式：提示)r4Y(H;A'X,z'?(x9n4b5\7p4d6B5E'y
（3）70.8-5.25-4.75=3D-w-Q(]5\7p4d6B5E'y
算式：提示7p0u3H;u3X(V5\7p4d6B5E'y