302乘以99加138怎么简便运算

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302乘以99加138怎么简便运算302乘以99加138怎么简便运算302乘以99加138怎么简便运算302×99+138=302×(100-1)+138=302×100-302+138=30200-

302乘以99加138怎么简便运算
302乘以99加138怎么简便运算

302乘以99加138怎么简便运算
302×99+138
=302×(100-1)+138
=302×100-302+138
=30200-(302-138)
=30200-164
=30000+(200-164)
=30000+36
=30036

302X100+138-320=302X100-182

302×99+138
=302×(100-1)+138
=302×100-302+138
=30200-(302-138)
=30200-164
=30036

302*99+138=(300+2)(100-1)+138=300*100+2*100-300*1-2+138=30036