问题 解答题
脱式计算(能简算的要用简算)
4.2×7.8+2.2×4.29.5×101(8×3.82)×1.250.125×72.
答案

(1)4.2×7.8+2.2×4.2,

=(7.8+2.2)×4.2,

=10×4.2,

=42;

(2)9.5×101,

=9.5×(100+1),

=9.5×100+9.5×1,

=950+9.5,

=959.5;

(3)(8×3.82)×1.25,

=8×3.82×1.25,

=(8×1.25)×3.82,

=10×3.82,

=38.2;

(4)0.125×72,

=0.125×8×9,

=1×9,

=9.

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