Question

求2道简便运算数学题谢谢

4*77+8*99还有一题666*333要简便运算的

Answer 1

1，4 x 77+8x99=4x7x11+8x9x11=28x11+72x11=11x(28+72)=11x100=1100
2，666x333=666x3x111=999x111=(1000-1)x111=111000-111=110889

Answer 2

4*77+8*99
=4*11*7+4*11*2*9
=44*7+44*18
=44*（7+18）
=44*25
=44*100/4
=1100

666*333
=111*6*111*3
=111*111*18
=12321*18
=12321*(20-2)
=246420-24642
=221778

Answer 3

4*77+8*99
=4*7*11+8*9*11
=28*11+72*11
=(28+72)*11
=100*11
=1100

666 * 333 = 221778(不能用简便运算）

Answer 4

4*77+8*99=4*77+4*198=4*275=1100
666*333=111*6*3*111=(100*18+10*18+18)*111=1998 *100+1998*10+1998=221778

Answer 5

4*77+8*99=11*(28+72)=11*100=1100