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1- = + = - = + = - =
400×5= 80+800= 150×6= 5×46 = 300×9=
34+27+16= 18+55+45= 25×13×4=
(8+4)×5= 19×6+11×6= 36×64+36×36=
①352+39-152
②50×28×4
③604-135-65
④3600÷5÷18
⑤99×15+15
⑥104×45-45×4
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