Question

简便计算：91÷2.6÷0.05 10.64＋7.65×2.4＋11.76

Answer 1

把2.6和0.05化为分式;即13/5 ;1/20
则91÷2.6÷0.05=91÷13/5÷1/20=91×5/13×20
91和13约了之后=7; 即7×5×20=700

10.64＋7.65×2.4＋11.76
先把7.65和2.4拆开为(7+0.65) 和(2+0.4)
于是原式子=7.65×2.4＋11.76+10.64
=(7+0.65) ×(2+0.4)＋11.76+10.64
=7×2+0.65×2+7×0.4+0.65×0.4+11.76+10.64
=14+1.3+2.8+0.26+11.76+10.64
=14+(1.3+2.8)+（0.26+10.64）+11.76
=14+4.1+10.9+11.76
=14+（4.1+10.9）+11.76
=14+15+11.76
=29+11+0.76
=40.76

Answer 2

91÷2.6÷0.05
=91/(2.6*0.05)
=91/0.13
=700
10.64＋7.65×2.4＋11.76
=22.4+7.65*(2+0.4)
=22.4+15.3+3.06
=40.76

Answer 3

7.65×2.4应该还有更简便的方法，大家思考一下！