7.5*27+19*2.5 11*11*11-11*11-10(简便计算)一定要简便计算
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7.5*27+19*2.5 11*11*11-11*11-10(简便计算)一定要简便计算
7.5*27+19*2.5 11*11*11-11*11-10(简便计算)
一定要简便计算
7.5*27+19*2.5 11*11*11-11*11-10(简便计算)一定要简便计算
250
12190
7.5*27+19*2.5
=2.5*3*27+2.5*19
=2.5*(81+19)
=2.5*100
=250;
11*11*11-11*11-10
=11*11(11-1)-10
=11*11*10-10
=10(11*11-1)
=10*(121-1)
=10*120
=1200.
7.5*27+19*2.5
=(2.5*3)*27+19*2.5
=2.5*(3*27)+19*2.5
=2.5*81+19*2.5
=2.5*(19+81)
=2.5*100
=250
11*11*11-11*11-10
=11*11*(11-1)-10
=11*11*10-10
=10*(11*11-1)
=10*(121-1)
=10*120
=1200
7.5*27+19*2.5=2.5*3*27+19*2.5=(81+19)*2.5=250
11*11*11-11*11-10=11*11(11-1)-10=1200
7.5*27+19+*2.5=2.5*3*27+2.5*19
=2.5*(81+19)
=2.5*100
=250
11*11*11-11*11-10
=11*11(11-1)-10
=11*11*10-10
=(121-1)*10
=1200
7.5*27+19*2.5＝7.5*(19+8)+19*2.5=19*(7.5+2.5)+7.5*8=250
11*11*11-11*11-10=11*11(11-1)-10=10*(11*11-1)=1200