请问下面这些题目哪些是能够使用简便计算的?请帮忙把能够使用简便计算的题目的具体过程告诉我,谢谢!

2025-04-03 23:50:09
推荐回答(2个)
回答1:

(1)1992×198.9-1991×198.8
=(1992-1991)x198.9
=1x198.9
=198.9

(2)十三又九分之一×十三分之九
=(13+1/9)x9/13
=13x9/13+1/9x9/13
=9+1/13
=9又13分之1

(3)101×七分之一-七分之一
=(101-1)x1/7
=100x1/7
=7分之100

(4)四十七分之六×48
=6/47x(47+1)
=6+6/47
=6又47分之6

回答2:

2.原式=33.02-57.55×4÷(2.5×4)=33.02-23.02=10 5.原式=3/5(7.27+2.73)=6 6.原式=4.85+5.15-(5/9+4/9)=9