Question

请问这两题简便运算怎么写？求学霸解答，要过程，谢谢

Answer 1

999x7778+333x666
=999x7778+999x222
=999x(7778+222)
=999x10000
=9990000

5.6x69.32+138.64x0.05+693.2x0.43
=693.2x0.56+693.2x0.01+693.2x0.43
=693.2x(0.56+0.01+0.43)
=693.2x1
=693.2

Answer 2

999×778+333×666
=999×778+999×222
=999×(778+222）
=999×1000
=999000

追问

下面还有一题

追答

999×7778+333×666
=999×7778+999×222
=999×(7778+222）
=999×8000
=7992000

5.6×69.32+138.64×0.05+693.2×0.43
=0.56×693.2+0.1×693.2+693.2×0.43
=693.2×（0.56+0.01+0.43）
=693.2×1
=693.2

Answer 3

999×7778+333×3×222=（7778+222）×999=8000×999= 7992000

5.6×69.32+69.32×2×0.05+4.3×69.32=69.32×（5.6+0.1+4.3）=693.2