(1)460+540÷20×5
=460+27×5,
=460+135,
=595;
(2)98.7×0.9+9.87
=98.7×(1-0.1)+9.87,
=98.7×1-98.7×0.1+98.7,
=98.7×2-9.87,
=197.4-9.87,
=187.53;
(3)(11÷46+18÷23)×92
=(
+11 46
)×92,18 23
=
×92+11 46
×92,18 23
=22+72,
=94;
(4)1
×[(2.25+53 4
)÷77%]?10.9 20
=1.75×[(2.25+5.45)÷0.77]-10,
=1.75×[7.7÷0.77]-10,
=1.75×10-10,
=17.5-10,
=7.5.
我不会~~~但还是要微笑~~~:)