用简便方法计算 1,84乘21减63乘。2,412乘81加512乘19.
用简便方法计算 1,84乘21减63乘。2,412乘81加512乘19.
84×21-63
=84×21-21×3
=(84-3)×21
=81×21
=(80+1)×21
=80×21+21
=1680+21
=1701
412×81+512×19
=412×81+(412+100)×19
=412×81+412×19+100×19
=412×(81+19)+100×19
=412×100+100×19
=100×(412+19)
=100×431
=43100
63乘21加38乘21减21用简便方法计算
63乘21加38乘21减21
=63×21+38×21-21
=21(63+38-1)
=21×100
=2100
63乘14加39乘14减2乘14用简便方法计算
63×14+39×14-2×14
=(63+39-2)×14
=100×14
=1400
93乘132减63乘4加63乘10用简便方法计算
93乘132减63乘4加63乘10用简便方法计算
93乘132减63乘4加63乘10
=93*132-63*4+63*10
=93*132+63*(10-4)
=12276+378
=12654
用简便方法计算53乘73减63乘63
53×73-63×63
=(63-10)×(63+10)-63×63
=63×63+63×10-63×10-10×10-63×63
=-100
624乘81减624加624乘20用简便方法计算
624乘81减624加624乘20用简便方法计算
624乘81减624加624乘20
=624*(81-1+20)
=624*100
=62400
127乘36加21乘36减48乘36用简便方法计算
127乘36加21乘36减48乘36用简便方法计算
=36×(127+21-48)
=36×100
=3600
用简便方法计算33乘21加22乘45减11乘53
用简便方法计算
33×21+22×45-11×53
=11×63+11×90-11×53
=11×(63+90-53)
=11×100
=1100
63乘24加63乘74用简便方法计算
63x24+63x74
=63x(24+74)
=63x98
=63x(100-2)
=63x100-63x2
=6300-126
=6174
希望帮到你 望采纳 谢谢 加油
63乘37加63乘63,简便方法计算。
63*37+63*63
=63*(37+63)
=63*100
=6300