42X12简便计算
42X12简便计算 -
回答：42x(10十2)
42x(10十2)
回答：42x(10十2)
42x(10十2)
42x125x8x5 =（125×8）x（42×5）1000×210 =210000
42x12十=12*（42+58）12*100 =1200
42x12+89x42-42。怎样简便计算? -
原式=42×（12+89－1）42×100 =4200
计算如下：42×12-7014)÷14 =42×12/14-7014/14 =3×12-1002/2 =36-501 =-465
42x12十58x15简便计算 -
42x12十58x15 =42x12十58x12+58x3 =(42+58)x12+174 =1200+174 =1374
42x128x8x5 =（42x5）x128x8 =210x（125+3）x8 =210x（125x8+3x8）210x（1000+24）210x1000+210x24 =210000+210x6x4 =210000+5040 =215040 谢谢，请采纳，
42X12十21x6怎幺简便计算? -
42x12十21x6 =21x2x12十21x6 =21x24十21x6 =21x(24十6)=21x30 =630
see