问题 计算题
能简算的要简算
(1)4.7+7.69+5.3+2.31=(2)53.78-13.6-37.4+6.22=(3)57×101- 57=    
(4)(520+480)÷50×4=(5)400-(1300÷ 65+35)=(6)60-(21.5-8.8)+7.3=
答案

(1)原式=4.7+5.3+(7.69+2.31)

                =20(2)原式=53.78+6.22-(13.6+37.4)

                =9(3)原式=57×(100-1)

                =5700

(4)原式=1000÷50×4

               =80(5)原式=400-55

               =345(6)原式=60-12.7+7.3

                =54.6

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问答题