已知,求m+n+p的值.
计算:(18a2b-6ab)÷(-6ab).
计算:
(1)(3×10-3)×(2×10-4);
(2)(3×10-5)÷(6×10-2).
(1)(-3ab)·(-2a)·(-a2b3);
(2)(25m2+15m3n-20m4)÷(-5m2).
计算:[7x5y3z+(xy)2]÷(-14xy2)= ________________.
计算:5a5b3c÷15a4b= ________________.