用简便方法计算: 45×98+45×2 452-(152+240) 99×27 1120÷16÷7 113×36-13×36 179-245+321-155
用简便方法计算:45×98+45×2452-(152+240)99×271120÷16÷7113×36-13×36179-245+321-155....
用简便方法计算: 45×98+45×2 452-(152+240) 99×27 1120÷16÷7 113×36-13×36 179-245+321-155.
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①45×98+45×2, =45×(98+2), =45×100, =4500; ②452-(152+240), =452-152-240, =60; ③99×27, =(100-1)×27, =2700-27, =2673; ④1120÷16÷7, =1120÷(16×7), =1120÷112, =10; ⑤113×36-13×36, =36×(113-13), =36×100, =3600; ⑥179-245+321-155, =(179+321)-(245+155), =400-400, =0. |
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