Question

简便方法计算 递等式计算

870×65+87×350
9999×7778+3333×6666
44×36+44×65-44
888×6+76×222

Answer 1

递等式计算怎么算！

Answer 2

870×65+87×350
=87×650+87×350
=87×（650+350）
=87×1000
=87000

9999×7778+3333×6666
=9999×7778+9999×2222
=9999×（7778+2222）
=9999×10000
=99990000

44×36+44×65-44
=44×（36+65-1）
=44×100
=4400

888×6+76×222
=222×24+76×222
=222×（24+76）
=222×100
=22200

Answer 3

870×65+87×350
=87×10×(65+35)
=870×100
=87000

9999×7778+3333×6666
=9999×(7778+2222)
=9999×10000
=99990000

44×36+44×65-44
=44×(36+65-1)
=44×100
=4400

888×6+76×222
=222×(4×6+72)
=222×(24+76)
=222×100
=22200

Answer 4

870×65+87×350 = 870×65+870×35 = 870×(65+50) = 87000
9999×7778+3333×6666 = 9999×7778+9999×2222 = 9999×(7778+2222) = 99990000
44×36+44×65-44 = 44×(36+65-1) = 4400
888×6+76×222 = 222×24+76×222 = 222×(24+76) = 22200

Answer 5

870×65+87×350
=87×650+87×350
=87×（650+350）
=87×1000
=87000

9999×7778+3333×6666
=9999×7778+9999×2222
=9999×（7778+2222）
=9999×10000
=99990000

44×36+44×65-44
=44×（36+65-1）
=44×100-44
=4400-44
=4356

888×6+76×222
=222×24+76×222
=222×（24+76）
=222×100
=22200