Question

(58+37÷45)x78简便运算？

Answer 1

(58+37÷45)x78
=(58x45/45+37/45)x78
= (58x45+37)x78/45
=[(60-2)x45+37]x26/15
=(2700-90+37) x26/15
=(2610+37) x26/15
=2647x26/15
=2647x(2x13)/15
=5294x(10+3）/15
=(52940+15882)/15
=68822/15

Answer 2

原式＝58×78+37×78÷45
＝58×78+37×26×3÷3÷15
＝58×78+37×26÷15
＝58×80-58×2+37×26÷15
＝4640-116+37×26÷15
≈4524+64.13
＝4588.13