能简便计算的简便计算就4道!(1)2061-5046÷87(2)33.2-8.28-1.72(3)4.17×3.9×5.83(4)12×（2分之1+4分之3）

Question

能简便计算的简便计算 就4道!
(1)2061-5046÷87 (2)33.2-8.28-1.72
(3)4.17×3.9×5.83 (4) 12×（2分之1+4分之3 ）

Answer 1

(1)
2061-5046÷87
= 2061-58
= 2003
(2)
33.2-8.28-1.72
=33.2-(8.28+1.72)
=33.2-10
=23.2
(3)
4.17×3.9×5.83
=72.9333
(4)
12×(1/2+3/4)
=12×(2/4+3/4)
=12×5/4
=3×5
=15