Question

400+480:4+[68:2+4×(20+12+18)]=;[1+(5×7-2×15)]:2×(2×8-15):[3:(1+14:7)+2]=;98+8×[1004-4×(8:2×2-4:4×2)]=;[1+2×(6+6:3)-5]:6=;1000-[409×(6:3)+56:8×5]=;[(35:7+21:7)×7+(3+9:3+27)]×7=;[(24×6+39×5)-2]+(2000-300:30)=;[(28×5:2×10)×5]+[31×(600:5+112:4)-83]=;

Answer 1

400+480:4+[68:2+4×(20+12+18)]=
400+120+(34+4×50)=
520+(34+200)=
520+234=754

[1+(5×7-2×15)]:2×(2×8-15):[3:(1+14:7)+2]=
[1+(35-30)]:2×(16-15):[3:(1+2)+2]=
(1+5):2×1:(3:3+2)=
6:2:(1+2)=
3:3=1

98+8×[1004-4×(8:2×2-4:4×2)]=
98+8×[1004-4×(4×2-1×2)]=
98+8×[1004-4×(8-2)]=
98+8×(1004-4×6)=
98+8×(1004-24)=
98+8x980=
98+7840=7938