①243-29-71
②13×25×4
③720÷18÷5
④35×98
⑤145+36+55+64
⑥76×101-76
①30.1-16.4-3.6
②25.5+7.91+2.09+4.5
③101×53-53
④235-(456+304)÷4
⑤720÷(89-5×16)
⑥860×[137-(162-33)]
①74×201
②1300-300÷25×4
③147×48-48×47
④32×125×25
⑤535-128-72
⑥199+136+281+174
0.25×8= 50%×0.4= 7÷7%= 23=