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脱式计算,能简算的要简算.(1)(23-19)×9(2)...

(1)(23-19)×9,=23×9-19×9,=6-1,=5;(2)80×579+78×579,=(80+78)×579,=158×579,=10;(3)79+12÷45+38,=79+58+38,=79+(58+38),=79+1,=179;(4)1÷110÷107×47,=10÷107×47,=7×47,=4.

你好,很高兴为你解答 0.19+1.9×3.2-19×0.23简算 具体过程如下图 。。。

(3/19+2/23)×19×23 =3/19×19×23+2/23×19×23 =46+38 =84

=71×19+322÷23 =71×19+14 =71×20-71+14 =1420-57 =1363

23×括号2/23+1/19括号乘以十九=2+1=3

解: 23-19 =23-(20-1) =23-20+1 =3+1 =4

简便计算 1.16+0.23-0.19 =1.16+0.23-(0.16+0.03) =1.16+0.23-0.16-0.03 =1.16-0.16+0.23-0.03 =1+0.2 =1.2

23x(87-6-19) =23x62 =23x(60+2) 23x60+23x2 =1380+46 =1426

(1)36×(14+16+19),=36×14+36×16+36×19,=9+6+4,=15+4,=19;(2)59×7+59×11,=59×(7+11),=59×18,=10;(3)23-89×34÷127,=23-23÷127,=23-18,=5;(4)[1-(14+38)]÷14,=[1-58]÷14,=38÷14,=32.

(27.2-23.6)×0.25 =3.6÷4 =0.9 199.7+19.7+9.7+0.9 =200-0.3+20-0.3+10-0.3 +0.9 =230 +0.9-0.9 =230 3.72×2.9+3.72×7.1 =3.72x(2.9+7.1) =3.72x10 =37.2

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