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(1)1600-704-275-225-296(2)5040÷42-936÷78(3)(21×12+1856)÷34(4)27+979+1973+9021(5)3291+599-898(6)711-1008÷72-86.

题目详情
(1)1600-704-275-225-296 (2)5040÷42-936÷78 (3)(21×12+1856)÷34
(4)27+979+1973+9021 (5)3291+599-898 (6)711-1008÷72-86.
▼优质解答
答案和解析
(1)1600-704-275-225-296,
=1600-(704+296)-(275+225),
=1600-1000-500,
=600-500,
=100;

(2)5040÷42-936÷78,
=120-12,
=108;

(3)(21×12+1856)÷34,
=(252+1856)÷34,
=2108÷34,
=62;

(4)27+979+1973+9021,
=(27+1973)+(979+9021),
=2000+10000,
=12000;

(5)3291+599-898,
=3291+600-1-900+2,
=3291+600-900-1+2,
=3891-900-1+2,
=2991-1+2,
=2990+2,
=2992;

(6)711-1008÷72-86,
=711-14-86,
=711-(14+86),
=711-100,
=611.