用简便方法计算.(1)0.37×12.5×0.15×8×2(2
用简便方法计算.(1)0.37×12.5×0.15×8×2(2)17.48×37-174.8×1.9+17.48×82(3)14.5+7.65×4+25.5+2.35×4...
用简便方法计算.(1)0.37×12.5×0.15×8×2(2)17.48×37-174.8×1.9+17.48×82(3)14.5+7.65×4+25.5+2.35×4+40.
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(1)0.37×12.5×0.15×8×2
=0.37×(12.5×8)×(0.15×2)
=0.37×100×0.3
=37×0.3
=11.1;
(2)17.48×37-174.8×1.9+17.48×82
=17.48×37-17.48×19+17.48×82
=17.48×(37-19+82)
=17.48×100
=1748;
(3)14.5+7.65×4+25.5+2.35×4+40
=(14.5+25.5)+(7.65×4+2.35×4)+40
=40+(7.65+2.35)×4+40
=40+10×4+40
=40+40+40
=120.
=0.37×(12.5×8)×(0.15×2)
=0.37×100×0.3
=37×0.3
=11.1;
(2)17.48×37-174.8×1.9+17.48×82
=17.48×37-17.48×19+17.48×82
=17.48×(37-19+82)
=17.48×100
=1748;
(3)14.5+7.65×4+25.5+2.35×4+40
=(14.5+25.5)+(7.65×4+2.35×4)+40
=40+(7.65+2.35)×4+40
=40+10×4+40
=40+40+40
=120.
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