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2222×17+3333×4+6666×97.68-3.56+2.32-5.441.25×3.2×0.25(0.625×6.8+0.625×4.2-0.625)÷0.625300÷0.125÷0.84000-1-2-3-…-77-78.

题目详情
2222×17+3333×4+6666×9
7.68-3.56+2.32-5.44
1.25×3.2×0.25
(0.625×6.8+0.625×4.2-0.625)÷0.625
300÷0.125÷0.8
4000-1-2-3-…-77-78.
▼优质解答
答案和解析
(1)2222×17+3333×4+6666×9
=1111×2×17+1111×3×4+1111×6×9,
=1111×(2×17+3×4+6×9),
=1111×(34+12+54),
=1111×100,
=111100;

(2)7.68-3.56+2.32-5.44
=7.68+2.32-3.56-5.44,
=10-(3.56+5.44),
=10-9,
=1;

(3)1.25×3.2×0.25
=1.25×0.8×4×0.25,
=(1.25×0.8)×(4×0.25),
=1×1,
=1;

(4)(0.625×6.8+0.625×4.2-0.625)÷0.625
=0.625×6.8÷0.625+0.625×4.2÷0.625-0.625÷0.625,
=6.8+4.2-1,
=11-1,
=10;

(5)300÷0.125÷0.8
=300÷(0.125×0.8),
=300÷0.1,
=3000;

(6)4000-1-2-3-…-77-78
=4000-(1+2+3-…+77+78),
=4000-(1+40+38×80),
=4000-(1+40+3040),
=4000-3081,
=919.