简便计算,你可以如下
=62*(36-1+35)
=62*70
=(60+2)*70
=60*70+2*70
=4200+140
=4340
提公因式62
62(36-1+35)=62*70=4340
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
62×36-62+62×35
= 62× ( 36-1+35)
= 62×70
= 4340
首先
脱式计算:
62×36-62+62×35
=62×(36-1+35)
=62×70
=(60+2)×70
=60×70+2×70
=4200+140
=4340