简便计算 169-25-25-50 0.58+3.9+0.42+6.1 189×3+7×189 25×173×4.
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(1)169-25-25-50
=169-(25+25+50)
=169-100
=69;
(2)0.58+3.9+0.42+6.1
=0.58+0.42+3.9+6.1
=(0.58+0.42)+(3.9+6.1)
=1+10
=11;
(3)189×3+7×189
=189×(3+7)
=189×10
=189;
(4)25×173×4
=25×4×173
=100×173
=17300.
=169-(25+25+50)
=169-100
=69;
(2)0.58+3.9+0.42+6.1
=0.58+0.42+3.9+6.1
=(0.58+0.42)+(3.9+6.1)
=1+10
=11;
(3)189×3+7×189
=189×(3+7)
=189×10
=189;
(4)25×173×4
=25×4×173
=100×173
=17300.
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