"1800除以46等于几"...1800除以46等于几

　"1800-1800除以45"...1800-1800除以45

　"1800除以45-16等于几"...1800除以45-16等于几

　"1800除以42+49×2等于几"...1800除以42+49×2等于几

　"1800-40除以25×100等于几"...1800-40除以25×100等于几

　"1800除以470"...1800除以470

　"1800除以410"...1800除以410

　"1800除以450%等于几"...1800除以450%等于几

　"1800除以47等于几"...1800除以47等于几

　"1800除以45"...1800除以45