怎样算简便就怎样算17.17-6.8-3.2; &
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怎样算简便就怎样算
17.17-6.8-3.2;
16.8×10.1;
63.4÷2.5÷0.4;
2.74×9.5+5×0.274.
17.17-6.8-3.2;
16.8×10.1;
63.4÷2.5÷0.4;
2.74×9.5+5×0.274.
(1)17.17-6.8-3.2
=17.17-(6.8+3.2)
=17.17-10
=7.17
(2)16.8×10.1
=16.8×(10+0.1)
=16.8×10+16.8×0.1
=168+1.68
=169.68
(3)63.4÷2.5÷0.4
=63.4÷(2.5×0.4)
=63.4÷1
=63.4
(4)2.74×9.5+5×0.274
=2.74×9.5+0.5×2.74
=2.74×(9.5+0.5)
=2.74×10
=27.4
=17.17-(6.8+3.2)
=17.17-10
=7.17
(2)16.8×10.1
=16.8×(10+0.1)
=16.8×10+16.8×0.1
=168+1.68
=169.68
(3)63.4÷2.5÷0.4
=63.4÷(2.5×0.4)
=63.4÷1
=63.4
(4)2.74×9.5+5×0.274
=2.74×9.5+0.5×2.74
=2.74×(9.5+0.5)
=2.74×10
=27.4