题目

计算。 ①7.36-(1.25+0.35) ②45×( + ) ③ ÷ × ④8×4×1.25×2.5 ⑤806×99+806 ⑥36×[1+( + )] 答案:①7.36-(1.25+0.35) =7.36-1.6 =5.76 ②45×( 59 + 29 ) =45×59+45×29 =25+10 =35 ③ 13 ÷ 25 × 715 =13×52× 715 = 718 ④8×4×1.25×2.5 =(8×1.25)×(4×2.5) =10×10 =100 ⑤806×99+806 =806×(99+1) =806×100 =80600 ⑥36×[1+( 23 + 12 )] =36×1+36×23+36×12 =36+24+18 =60+18 =78
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