题目内容

【题目】计算下列各题,能简算的要简算

×6﹣4÷

②7.2﹣4.28+2.8﹣0.72

③53.4÷[1÷(3.1﹣3.09)]

÷ ×

÷[( + )÷15]

⑥36×0.71+3.6×2.9.

【答案】解: ×6

= ×6

=64×

=2×

=

7.24.28+2.80.72

=7.2+2.84.28+0.72

=105

=5

53.4÷[1÷3.13.09]

=53.4÷[1÷0.01]

=53.4÷100

=0.534

÷ ×

= × ×

=

=

÷[ + ÷15]

= ÷[ ÷15]

= ÷ ÷15

= ×

=

36×0.71+3.6×2.9

=3.6×7.1+3.6×2.9

=3.6×7.1+3.9

=3.6×10

=36

【解析】把除法变成乘法,再根据乘法分配律进行计算即可;根据加法交换律和减法的性质进行计算即可;先算小括号里的减法,再算中括号里的除法,最后算括号外的除法;先算除法和乘法,再算减法;先算小括号里的加法,再按照从左到右的顺序计算即可;根据乘法分配律进行计算即可.

六、<b >列算式或方程计算</b>

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