神机妙算细又巧!14.64+3.7×2.8 72.5×0.4-81.2÷56 13.8×0.45+138×0....
神机妙算细又巧!14.64+3.7×2.872.5×0.4-81.2÷5613.8×0.45+138×0.055(1.5÷4)÷(0.15÷4)(1.25+1.25+1....
神机妙算细又巧!14.64+3.7×2.8 72.5×0.4-81.2÷56 13.8×0.45+138×0.055(1.5÷4)÷(0.15÷4)(1.25+1.25+1.25+1.25)×0.8×0.25.
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(1)14.64+3.7×2.8,
=14.64+10.36,
=25;
(2)72.5×0.4-81.2÷56,
=29-1.45,
=27.55;
(3)13.8×0.45+138×0.055,
=13.8×0.45+13.8×0.55,
=13.8×(0.45+0.55),
=13.8×1,
=13.8;
(4)(1.5÷4)÷(0.15÷4),
=1.5÷4÷0.15×4,
=1.5÷0.15×4÷4,
=10;
(5)(1.25+1.25+1.25+1.25)×0.8×0.25,
=1.25×4×0.8×0.25,
=(1.25×0.8)×(4×0.25),
=1×1,
=1.
=14.64+10.36,
=25;
(2)72.5×0.4-81.2÷56,
=29-1.45,
=27.55;
(3)13.8×0.45+138×0.055,
=13.8×0.45+13.8×0.55,
=13.8×(0.45+0.55),
=13.8×1,
=13.8;
(4)(1.5÷4)÷(0.15÷4),
=1.5÷4÷0.15×4,
=1.5÷0.15×4÷4,
=10;
(5)(1.25+1.25+1.25+1.25)×0.8×0.25,
=1.25×4×0.8×0.25,
=(1.25×0.8)×(4×0.25),
=1×1,
=1.
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