77.78×99.99+6.66×333.3简算

Question

77.78×99.99+6.66×333.3简算

Answer 1

77.78×99.99+6.66×33.33
=77.78×99.99+2.22×3×33.33
=（77.78+2.22）×99.99
=80×99.99
=80×（100-0.01）
=80×100-80×0.01
=8000-0.8
=7999.2

Answer 2

应该是6.666吧

77.78×99.99+6.666×333.3
=77.78×99.99+66.66×33.33
=77.78×99.99+22.22x3×33.33
=77.78×99.99+22.22x99.99
=(77.78+22.22)x99.99
=100x99.99
=9999本回答被网友采纳

Answer 3

应是6.666×333.3

Answer 4

77.78*99.99+6.66*333.3=77.78*99.99+2.22*999.9=99.99*（77.78+2.22*10）=（100-0.01）*99.98=（100-0.01）*（100-0.02）=100*100-（0.01+0.02）*100-0.01*0.02=10000-3-0.0002=9996.99998

Answer 5

55x66+66x77+77x88+88x99
=11x11x5x6+11x11x6x7+11x11x7x8+11x11x8x9
=11x11x(5x6+6x7+7x8+8x9)
=11x11x(6x(5+7)+8x(7+9))
=11x11x(6x12+8x16)
=11x11x(72+128)
=121x200
=24200