(1)762-357+438-243(2)(34+16-512)÷136(3)(200.6×365+2006×63.5)×40%(4)415×5+3247÷4+0.25×124(5)(0.5+14+318÷1.25)÷(514-1.25×135)(6)23+215+235+…+2399.-数学
题文
(1)762-357+438-243 (2)(
(3)(200.6×365+2006×63.5)×40% (4)4
(5)(0.5+
(6)
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答案
(1)762-357+438-243, =(762+438)-(357+243), =1200-600, =600; (2)(
=(
=
=27+6-15, =33-15, =18; (3)(200.6×365+2006×63.5)×40%, =(200.6×365+200.6×635)×40%, =(365+635)×200.6×40%, =1000×200.6×0.4, =200600×0.4, =80240; (4)4
=(4+
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