Question

Dau coroana,și sunt și multe puncte puncte va roggg!!eurgent toate dacă puteți!

Answer 1

d)-3/10-4/15=(-3×3-4×2)/30=(-9-8)/30=-17/30
e)9/20-8/16=9/20-1/2=(9-1×10)/20=-1/20
f)1/2+1/3-1/4=(1×6+1×4-1×3)/12=(6+4-3)/12=7/12
g)2/21-13/42+1/70=(2×2-13)/42+1/70=-9/42+1/70=-3/14+1/70=(-3×5+1)/70=-14/70=-1/5
h)12/36+1/9-5/9=1/3-4/9=(1×3-4)/9=-1/9
i)3+1/2=(3×2+1)/3=7/3
j)4/3+0=4/3
k)1/7-4/3+6/7+1/3=7/7-3/3=1-1=0
l)100/200+101/303+50/300=1/2+1/3+1/6=(1×3+1×2+1)/6=6/6=1
m) 3 3/4 - 3 1/4 =3×(3/4-1/4)=3×2/4=3×1/2=3/2