Question

0.25+0.25+0.25+0.25✘1.75的简便计算方法？

Answer 1

0.25+0.25+0.25+0.25×1.75的简便运算
解法一:
0.25+0.25+0.25+0.25×1.75
=0.25×3+0.25×1.75
=0.25×(3+1.75)
=0.25×4.75
=0.25×(5－0.25)
=0.25×5－0.25×0.25
=1/4×5－1/4×1/4
=5/4－1/16
=20/16－1/16
=19/16

方法二
0.25+0.25+0.25+0.25×1.75
=0.5+0.25+0.25×1.75
=0.75+0.25×1.75
=0.75+0.25×(2－0.25)
=0.75+0.25×2－0.25×0.25
=0.75+0.5－1/4×1/4
=1.25－1/4×1/4
=5/4－1/16
=20/16－1/16
=19/16

Answer 2

0.25＋0.25＋0.25＋0.25×1.75
＝0.25×（1＋1＋1＋1.75）
＝1／4×（3＋1又3／4）
＝1／4×4又3／4
＝1／4×19／4
＝19／16
＝1又3／16

Answer 3

=0.25x（3+1.75）
=0.25x4.75
=0.25x4+0.25x0.75
=1+0.2
=1.2

Answer 4

0.25+0.25+0.25+0.25x1.75
=0.25x(1+1+1+1.75)
=0.25x4.75
=1.1875

Answer 5

0.25+0.25+0.25+0.25✘1.75
=0.25×（1+1+1+1.75）
=1/4×4,75
=1/4×（4+3/4)
=1/4×4+1/4×3/4
=1+3/16
=1又(3/16)