简便计算. 44+37+56 163+49+261 74+(137+326) 249+402 189+35+211+165 483-236-64 582-157-182 6
简便计算.44+37+56163+49+26174+(137+326)249+402189+35+211+165483-236-64582-157-18265×5×215...
简便计算. 44+37+56 163+49+261 74+(137+326) 249+402 189+35+211+165 483-236-64 582-157-182 65×5×2 15×23×4 36×25 25×125×32 35×22 5×(63×2) 540÷45÷2 540÷36.
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(1)44+37+56,
=44+56+37,
=100+37,
=137;
(2)163+49+261,
=163+(49+261),
=163+310,
=473;
(3)74+(137+326),
=137+(74+326),
=137+400,
=537;
(4)249+402,
=249+(400+2),
=(249+400)+2,
=649+2,
=651;
(5)189+35+211+165,
=(189+211)+(35+165),
=400+200,
=600;
(6)483-236-64,
=483-(236+64),
=483-300,
=183;
(7)582-157-182,
=582-182-157,
=400-157,
=243;
(8)65×5×2,
=65×(5×2),
=65×10,
=650;
(9)15×23×4,
=15×4×23,
=60×23,
=1380;
(10)36×25,
=(4×9)×25,
=(4×25)×9,
=100×9,
=900;
(11)25×125×32,
=25×125×(4×8),
=(25×4)×(125×8),
=100×1000,
=100000;
(12)35×22,
=35×(20+2),
=35×20+35×2,
=700+70,
=770;
(13)5×(63×2),
=(5×2)×63,
=10×63,
=630;
(14)540÷45÷2,
=540÷(45×2),
=540÷90,
=6;
(15)540÷36,
=540÷(9×4),
=540÷9÷4,
=60÷4,
=15.
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