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用简便方法计算.87×10167+79+87+2913.55-3.76+5.45-7.2424×(512+124+38)
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用简便方法计算.
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答案和解析
(1)87×101, =87×(100+1), =87×100+87, =8700+87, =8787; (2)
=(
=2+1, =3; (3)13.55-3.76+5.45-7.24, =(13.55+5.45)-(3.76+7.24), =19-11, =8; (4)24×(
=24×
=10+1+9, =20. |
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