怎样算简便就怎样算.6.45+1.36-6.45+7.64 2.7×(100+2) 9.64-7.3-0.7 4.63÷
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怎样算简便就怎样算. 6.45+1.36-6.45+7.64 | 2.7×(100+2) | 9.64-7.3-0.7 |
4.63÷[(9.6+2.2)-7.17] | 0.5×2.5×4. |
(1)6.45+1.36-6.45+7.64,
=(6.45-6.45)+(1.36+7.64),
=0+9,
=9;
(2)2.7×(100+2),
=2.7×100+2.7×2,
=270+5.4,
=275.4;
(3)9.64-7.3-0.7,
=9.64-(7.3+0.7),
=9.64-8,
=1.64;
(4)4.63÷[(9.6+2.2)-7.17],
=4.63÷[11.8-7.17],
=4.63÷4.63,
=1;
(5)0.5×2.5×4,
=0.5×(2.5×4),
=0.5×10,
=5.
=(6.45-6.45)+(1.36+7.64),
=0+9,
=9;
(2)2.7×(100+2),
=2.7×100+2.7×2,
=270+5.4,
=275.4;
(3)9.64-7.3-0.7,
=9.64-(7.3+0.7),
=9.64-8,
=1.64;
(4)4.63÷[(9.6+2.2)-7.17],
=4.63÷[11.8-7.17],
=4.63÷4.63,
=1;
(5)0.5×2.5×4,
=0.5×(2.5×4),
=0.5×10,
=5.