题目内容

【题目】脱式计算。

(371-296)×9 (205-142)÷7 212-8×6

152+72÷9 520-160×3 42÷6×23

2000×3+1860 150×9-120 (406-385)×5

【答案】675;9;164;

160;40;161;

7860;1230;105

【解析】

(371-296)×9

=75×9

=675

(205-142)÷7

=63÷7

=9

212-8×6

=212-48

=164

152+72÷9

=152+8

=160

520-160×3

=520-480

=40

42÷6×23

=7×23

=161

2000×3+1860

=6000+1860

=7860

150×9-120

=1350-120

=1230

(406-385)×5

=21×5

=105

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