Question

287x36-87Ⅹ63用乘法分配律怎么写？

Answer 1

乘法分配律为：两个数的和与一个数相乘，先将它们与这个数分别相乘，再相加，积不变．即：（a+b）×c=a×c+b×c．反过来则：a×c+b×c=（a+b）×c
287×36-87×36
= 36× ( 287-87）
= 36×200
= 7200

Answer 2

287x36-87Ⅹ63
=200*36+87*36-87*63
=7200-87*27
=7200-87*30+87*3
=7200-2610+261
=5200-610+261
=5000-210+61
=4800+51
=4851