a)30,04+46,6+52,2+2,2
=30,4+46,6+54,4
=30,4+101
=131,4
b)100-3,5-2,5-4
=100-(3,5+2,5)-4
=100-(6+4)
=100-10
=90
c)0,25x40x9,84
=(0,25x40)x9,84
=10x9,84
=98,4
d)35x18-9x70+100
=35(18-9x2)+100
=35(18-18)+100
=35x0+100
=135
\(30,04+46,6+52,2+2,2\)
\(=76,64+54,4\)
\(=131,04\)