计算下面各题,能简算的要写出简算过程 1.8×(4.7-3.87÷0.9) 7.28-3.14+1.72-2.86 4×0.8
计算下面各题,能简算的要写出简算过程1.8×(4.7-3.87÷0.9)7.28-3.14+1.72-2.864×0.8×2.5×12.50.65×14+87×65%-6...
计算下面各题,能简算的要写出简算过程 1.8×(4.7-3.87÷0.9) 7.28-3.14+1.72-2.86 4×0.8×2.5×12.5 0.65×14+87×65%-65%
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(1)1.8×(4.7-3.87÷0.9),
=1.8×(4.7-4.3),
=1.8×0.4,
=0.72;
(2)7.28-3.14+1.72-2.86,
=(7.28+1.72)-(3.14+2.86),
=9-6,
=3;
(3)4×0.8×2.5×12.5,
=(4×2.5)×(0.8×12.5),
=10×10,
=100;
(4)0.65×14+87×65%-65%,
=0.65×14+87×0.65-0.65,
=0.65×(14+87-1),
=0.65×100,
=65.
=1.8×(4.7-4.3),
=1.8×0.4,
=0.72;
(2)7.28-3.14+1.72-2.86,
=(7.28+1.72)-(3.14+2.86),
=9-6,
=3;
(3)4×0.8×2.5×12.5,
=(4×2.5)×(0.8×12.5),
=10×10,
=100;
(4)0.65×14+87×65%-65%,
=0.65×14+87×0.65-0.65,
=0.65×(14+87-1),
=0.65×100,
=65.
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