726+44+656+274=(726+)+(44+)=+=
66+845=
75+39=39+
251+348+249=(251+)+348
164+224+136+176=( )
305+49=+305
37+1616+37 42-1943-19 51+1932+28
①33.7-(27.9+3.7)
②8400÷8-23×40
③213×[(22+59)÷9]
④125×56
⑤532+187+468-87
⑥(200+4)×25
⑦101×78
⑧27.89+2.3-7.89
①85×199+85
②728-(350+228)
③(25+11)×40
④99×15
⑤358+478+642
⑥125×25×16
25+34=34+ 18+27=2718
32+43=+32 2634=34+26
16+29=+ 4758=5847