神机妙算细又巧.(计算下面各题能简算的要简算)21.28-21.28÷7×30.32×...
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发布时间:2024-09-25 14:32
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时间:2024-10-04 20:08
(1)21.28-21.28÷7×3,
=21.28-3.04×3,
=21.28-9.12,
=12.16;
(2)0.32×25×12.5,
=0.8×0.4×25×12.5,
=(0.8×12.5)×(0.4×25),
=10×10,
=100;
(3)2.5×4.7-2.5+2.5×6.3,
=2.5×(4.7-1+6.3),
=2.5×10,
=25;
(4)(77.4-3.096÷0.4)÷0.03,
=(77.4-7.74)÷0.03,
=69.66÷0.03,
=2322;
(5)7.74×(2.8-1.3)+1.5×2.26,
=7.74×1.5+1.5×2.26,
=1.5×(7.74+2.26),
=1.5×10,
=15.
神机妙算细又巧.(计算下面各题能简算的要简算)21.28-21.28÷7×30.32×...
(1)21.28-21.28÷7×3,=21.28-3.04×3,=21.28-9.12,=12.16;(2)0.32×25×12.5,=0.8×0.4×25×12.5,=(0.8×12.5)×(0.4×25),=10×10,=100;(3)2.5×4.7-2.5+2.5×6.3,=2.5×(4.7-1+6.3),=2.5×10,=25;(4)(77.4-3....