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2)84-24=60
3)28-70+140=98
4)60+100-20=140
b)(√147 - 2√3)4√3=4*(√441-2√9)=4*(21-6)=4*15=60
c)(√28 - 5√7 + √700)2√7=2*(√196-5√49+√4900)=2*(14-5*7+70)=2*49=98
d)(√90 + √250 - √10)√40=√3600+√10000-√400=60+100-20=140