题目内容
脱式计算
60×7+148
550÷5×2
801÷(3×3)
157-23×4
78÷3÷2
(183+246)÷3.
60×7+148
550÷5×2
801÷(3×3)
157-23×4
78÷3÷2
(183+246)÷3.
分析:(1)先算乘法,再算加法;
(2)从左往右依次运算;
(3)先算括号内的,再算括号外的;
(4)先算乘法,再算减法;
(5)(6)运用除法的运算性质简算.
(2)从左往右依次运算;
(3)先算括号内的,再算括号外的;
(4)先算乘法,再算减法;
(5)(6)运用除法的运算性质简算.
解答:解:(1)60×7+148
=420+148
=568;
(2)550÷5×2
=110×2
=220;
(3)801÷(3×3)
=801÷9
=89;
(4)157-23×4
=157-92
=65;
(5)78÷3÷2
=78÷(3×2)
=78÷6
=13;
(6)(183+246)÷3
=183÷3+246÷3
=61+82
=143.
=420+148
=568;
(2)550÷5×2
=110×2
=220;
(3)801÷(3×3)
=801÷9
=89;
(4)157-23×4
=157-92
=65;
(5)78÷3÷2
=78÷(3×2)
=78÷6
=13;
(6)(183+246)÷3
=183÷3+246÷3
=61+82
=143.
点评:此题主要考查整数的四则混合运算的运算顺序和应用运算性质进行简便计算.
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