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用简便方法计算.100-99+98-97+96-95…+4-3+2-140002+4002+402+42.
题目详情
用简便方法计算.
100-99+98-97+96-95…+4-3+2-1
40002+4002+402+42.
100-99+98-97+96-95…+4-3+2-1
40002+4002+402+42.
▼优质解答
答案和解析
(1)100-99+98-97+96-95+…+4-3+2-1
=(100-99)+(98-97)+(96-95)+…+(4-3)+(2-1)
=1+1+1+…+1+1
=1×50
=50
(2)40002+4002+402+42
=40000+2+4000+2+400+2+40+2
=40000+4000+400+40+2×4
=44440+8
=44448
=(100-99)+(98-97)+(96-95)+…+(4-3)+(2-1)
=1+1+1+…+1+1
=1×50
=50
(2)40002+4002+402+42
=40000+2+4000+2+400+2+40+2
=40000+4000+400+40+2×4
=44440+8
=44448
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