下面各题,能简算的要用简便方法计算.9+0.56+6.1+0.44 50÷2.5+1.8×4.5 87
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(1)9+0.56+6.1+0.44
=(9+6.1)+(0.56+0.44)
=15.1+1
=16.1;
(2)50÷2.5+1.8×4.5
=20+8.1
=28.1;
(3)87×[40÷(3.49-3.09)]
=87×[40÷0.4]
=87×100
=8700;
(4)0.8×(12.5+0.125)
=0.8×12.5+0.8×0.125
=10+0.1
=10.1.
=(9+6.1)+(0.56+0.44)
=15.1+1
=16.1;
(2)50÷2.5+1.8×4.5
=20+8.1
=28.1;
(3)87×[40÷(3.49-3.09)]
=87×[40÷0.4]
=87×100
=8700;
(4)0.8×(12.5+0.125)
=0.8×12.5+0.8×0.125
=10+0.1
=10.1.
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