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
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+3.7×2.872.5×0.4-81.2÷5613.8×0.45+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. |
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