(2/7+5/8×8/7)÷9/35簡便計算

(2/7+5/8×8/7)÷9/35簡便計算


(2/7+5/8×8/7)÷9/35
=(2/7+5/7)÷9/35
=1÷9/35
=35/9



5.89-(5.89-2.35)+7.65怎樣簡便計算?


5.89-(5.89-2.35)+7.65
=(5.89-5.89)+(2.35+7.65)
=0+10
=10



用簡便計算:(-5.35)*(-3)+5.35*(-7)+5.35*4


(-5.35)*(-3)+5.35*(-7)+5.35*4=5.35*(3)+5.35*(-7)+5.35*4
=5.35*(3-7+4)
=0



125*25*50*40*4*8*2*5用簡便計算


125*25*50*40*4*8*2*5
=125*8*25*40*50*2*4*5
=1000*1000*100*20
=2000000000