-13×三分之二-0.34×七分之二+三分之一×(-13)-七分之五*0.34
=-13×2/3 -0.34×2/7 -13×1/3 -5/7 ×0.34
=-13×(2/3+1/3) -0.34×(2/7+5/7)
=-13×1 -0.34×1
=-13.34
(2×3×4×5)×(二分之一-三分之一-四分之一+五分之一)
=(2×3×4×5)×(1/2-1/3 -1/4 +1/5)
=(2×3×4×5)×(1/2)-(2×3×4×5)×(1/3)-(2×3×4×5)×(1/4)+(2×3×4×5)×(1/5)
=3×4×5-2×4×5-2×3×5+2×3×4
=60-40-30+24
=14
-1.57×(+21.8)+6.28×(-24.7)-3.14×39.7
=-1.57×21.8 +1.57×4×(-24.7) -1.57×2×39.7=-1.57(21.8+4×24.7+2×39.7)
=-1.57×200-38)+52+118+(-62)= -100+170=70
抱歉,题有点少,但答案都是一步步算出来的
12+35+(-23)+0= 47-23=24
(-6)+8+(-4)+12 = 10
27+(-26)+33+(-27)=33-26=7
39+[-23]+0+[-16]= 39-39=0
[-18]+29+[-52]+60= 19
[-3]+[-2]+[-1]+0+1+2= -3
[-301]+125+301+[-75]= 125-75=40
(-7分之1)+(-7分之2)+1又7分之3 =1
-0.5-(-3 )+2.75-(+7 )2.75-10.5=-7.75
39+[-23]+0+[-16]= 0
[-18]+[-52]+60= -10
[-3]+[-2]+[-1]+0+1+2= -3
=-314
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