32.9 - (14.2 + 7.1) - 4.2 with the simplest method | Math enthusiast | Mathematical art

32.9 - (14.2 + 7.1) - 4.2 with the simplest method

32.9-(14.2+7.1)-4.2
=32.9-7.1-（14.2+4.2）
=25.8-18.4
=7.4

How to calculate 666 + 987 * 654 / 987 * 655-321

Original formula = (666-11) + 654 * 655 - (321-11)
=655+655*654-310
=655*655-310
=(600+55)*(600+55)-310
=360000+2*33000+[(50+5)*(50+5)]-310
=360000+66000+（2500+500+25）-310
=426000+3025-310
=429025-310
=428715

（987655-321）/（666+987654）*4.5/0.25

（987*655-321）/（666+987*654）*4.5/0.25
=（987*654+987-321）/（666+987*654）*（4.5×4）
=（987*654+666）/（666+987*654）*18
=18

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