(86+19)*(95-69)怎么简便计算
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(86+19)*(95-69)怎么简便计算
=105x26
=(100+5)x26
=2600+130
=2730
(86+20-1)*(100-5-70+1)
=105*26
=(100+5)*26
=2600+130
=2730
=(86+14+5)*(95+5-5-69)
=(100+5)*(100-74)
=(100+5)*26
=26*100+26*5
=2600+130
=2730