3.11×30+31.1×2.8+6.22×21的简便运算?
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3.11×30+31.1×2.8+6.22×21
=3.11x30+3.11x10x2.8+3.11x2x21
=3.11x(30+10x2.8+2x21)
=3.11x100
=311
运用乘法结合律:AxB+AxC=Ax(B+C)
乘法交换律:AxBxC=Ax(BxC)
=3.11x30+3.11x10x2.8+3.11x2x21
=3.11x(30+10x2.8+2x21)
=3.11x100
=311
运用乘法结合律:AxB+AxC=Ax(B+C)
乘法交换律:AxBxC=Ax(BxC)
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答:简便运算如下:
3.11x30+31.1x2.8+6.22x21
=3.11x30+3.11x28+3.11x2x21
=3.11x(30+28+42)
=3.11x100
=311
3.11x30+31.1x2.8+6.22x21
=3.11x30+3.11x28+3.11x2x21
=3.11x(30+28+42)
=3.11x100
=311
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简便运算如下:
3.11x30+31.1x2.8+6.22x21
=3.11x30+3.11x28+3.11x2x21
=3.11x(30+28+42)
=3.11x100
=311
3.11x30+31.1x2.8+6.22x21
=3.11x30+3.11x28+3.11x2x21
=3.11x(30+28+42)
=3.11x100
=311
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