Question

2-0.72➗4✖️2.5巧算？

（12.5+1.25+0.125）✖️80巧算

Answer 1

先算4乘以2.5得到10，再用0.72除以10得到0.072，最后再计算2-0.072=1.928

Answer 2

2-0.72÷4x2.5巧算？
2-0.72÷4x2.5
=2-0.18x2.5
=2-0.09x2x2.5
=2-0.09x5
=2-0.45
=1.55
简单的数学运算，不需要什么技巧！

Answer 3

2-0.72÷4x2.5
可以将4x2.5=10先计算
再算0.72÷10=0.072
最后算2-0.072=1.928
考虑加减乘除混合运算的顺序，先乘除后加减

Answer 4

原式=2-0.72×2.5÷4
=2-0.08×9×2.5÷4
=2-0.08×2.5×9÷4
=2-0.2×9÷4
=2-0.45
=1.55

Answer 5

先乘除後加减，
原式
=2-0.72/4*2.5
=2-0.72/4*5/2
=2-0.72/2*5
=2-3.6/2
=2-1.8=0.2