用简便方法计算. (1)3.14× 3 5 +3.14× 2 5 (2) 1 4 5 ×2
用简便方法计算.(1)3.14×35+3.14×25(2)145×25%+14×2.2(3)87.5×19-87.5×8-87.5(4)0.77×(67+211)...
用简便方法计算. (1)3.14× 3 5 +3.14× 2 5 (2) 1 4 5 ×25%+ 1 4 ×2.2 (3)87.5×19-87.5×8-87.5 (4)0.77×( 6 7 + 2 11 )
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(1)3.14×
=3.14×(
=3.14×1, =3.14; (2) 1
=1.8×
=
=
=1; (3)87.5×19-87.5×8-87.5, =87.5×19-87.5×8-87.5×1, =87.5×(19-8-1), =87.5×10, =875; (4)0.77×(
=0.77×
=0.66+0.14, =0.8. |
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